Document and Entity Information Document And Entity Information [Abstract] Statement [Table] Statement Line Items Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Trading Symbol Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Consolidated Balance Sheets [Abstract] Assets Abstract ASSETS Assets, Current [Abstract] CURRENT ASSETS: Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Accounts receivable2 Accounts receivable-net Current portion of accounts receivable-net Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Contract revenues in excess of billings Inventory Net Inventories Prepaid expenses and other current assets Assets, Current Total current assets PROPERTY AND EQUIPMENT - Net PROPERTY AND EQUIPMENT-Net Property and equipment - net Intangible Assets, Net (Including Goodwill) GOODWILL AND OTHER INTANGIBLE ASSETS-Net INVENTORIES - Noncurrent INVENTORIES-Noncurrent INVESTMENTS IN JOINT VENTURES INVESTMENTS IN JOINT VENTURES Investment in joint ventures Other noncurrent assets OTHER Assets Total assets TOTAL Liabilities and Equity [Abstract] LIABILITIES AND EQUITY Liabilities, Current [Abstract] CURRENT LIABILITIES: Accounts payable Accrued Liabilities Current Accrued expenses Total accrued expenses Billings in excess of contract revenues Total billings in excess of contract revenues Long-term Debt, Current Maturities Current portion of long term debt Liabilities, Current Total current liabilities Senior Notes 7 3/8% SENIOR NOTES Line of Credit Facility, Amount Outstanding REVOLVING CREDIT FACILITY Notes Payable, Noncurrent NOTES PAYABLE DEFERRED INCOME TAXES OTHER Liabilities Total liabilities COMMITMENTS AND CONTINGENCIES (Note 8) EQUITY: Common stock-$.0001 par value; 90,000,000 authorized, 58,671,956 and 58,542,038 shares issued and outstanding at June 30, 2010 and December 31, 2009, respectively. Common stock-$.0001 par value; 90,000 authorized, 60,379 and 60,170 shares issued and outstanding at March 30, 2015 and December 31, 2014, respectively. Additional paid-in capital Accumulated deficit Accumulated deficit Accumulated other comprehensive income (loss) Accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Total Great Lakes Dredge & Dock Corporation equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest BALANCE - value BALANCE - value TOTAL EQUITY Liabilities and Equity TOTAL Common Stock, Par Value Common stock, par value Common Stock, Shares authorized Common stock, shares authorized Common Stock, Shares issued Common stock, shares issued Common Stock, Shares outstanding Common stock, shares outstanding Interest Rate, Stated Percentage Stated interest rate Consolidated Statements Of Operations [Abstract] Contract revenues Contract revenues Costs of contract revenues Costs of contract revenues Costs of contract revenues Gross Profit Gross profit General and administrative expenses General and administrative expenses General and administrative expenses Gain (Loss) on Sale of Other Assets Loss on sale of assets-net (Gain) loss on sale of assets-net Operating Income (Loss) Operating income (loss) Operating income (loss) Interest expense - net Interest expense-net Equity in loss of joint ventures Equity in loss of joint ventures Equity in loss of joint ventures Foreign Currency Transaction Loss, before Tax Other income (expense) Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Loss from continuing operations before income taxes Income tax provision Income tax (provision) benefit Income tax benefit IncomeLossFromContinuingOperations Loss from continuing operations Loss from continuing operations Loss from discontinued operations, net of income taxes Loss from discontinued operations, net of income taxes Loss from discontinued operations, net of income taxes Net Income (Loss) Attributable to Parent Net loss attributable to common stockholders of Great Lakes Dredge & Dock Corporation Net loss attributable to common stockholders of Great Lakes Dredge & Dock IncomeLossFromContinuingOperationsPerBasicShare Loss per share from continuing operations - basic IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare Basic loss per share attributable to discontinued operations, net of tax Basic loss per share attributable to discontinued operations, net of tax Basic loss per share attributable to Great Lakes Dredge & Dock Corporation Basic weighted average shares Weighted-average common shares outstanding - basic and diluted Basic weighted average shares IncomeLossFromContinuingOperationsPerDilutedShare Loss per share from continuing operations - diluted IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare Diluted loss per share attributable to discontinued operations, net of tax Diluted earnings (loss) per share attributable to Great Lakes Dredge & Dock Corporation Diluted loss per share attributable to Great Lakes Dredge & Dock Corporation Diluted weighted average shares Weighted-average common shares outstanding - diluted Diluted weighted average shares Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract] Net income (loss) Net loss Net loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Currency translation adjustment-net of tax (1) Change in fair value of derivatives-net of tax Net unrealized gain on derivatives-net of tax Net unrealized (gain) loss on derivatives-net of tax (2) Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss-net of tax Net unrealized gain on derivatives-net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Total comprehensive income (loss) Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax Currency translation adjustment, tax Consolidated Statements Of Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Parent [Member] Parent [Member] Common Stock [Member] Common Stock [Member] Additional Paid In Capital [Member] Additional Paid-In Capital [Member] Accumulated Deficit [Member] Accumulated Deficit [Member] Accumulated Deficit [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss [Member] Noncontrolling Interest [Member] Noncontrolling Interests [Member] Shares, Issued BALANCE - shares BALANCE - shares Share-based compensation, Value Share-based compensation, Shares Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock units, including impact of shares withheld for taxes, value Vesting of RSU's Vesting of restricted stock units, including impact of shares withheld for taxes, shares Exercise of options and purchases from employee stock plans, Value Exercise of options and purchases from employee stock plans, Shares Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Excess income tax benefit from share based compensation Distributions paid to noncontrolling interests. Distributions paid to noncontrolling interests Distributions paid to noncontrolling interests Consolidated Statements Of Cash Flows [Abstract] OPERATING ACTIVITIES: Adjustments to reconcile net loss to net cash flows used in operating activities: Depreciation and amortization Deferred Income Tax Expense Benefit Deferred income taxes Gain on dispositions of property and equipment (Gain) loss on sale of assets Amortization of deferred financing fees Unrealized Gain (Loss) on Derivatives Unrealized net loss from mark-to-market valuations of derivatives Foreign Currency Transaction Gain (Loss), Unrealized Unrealized foreign currency gain Share-based compensation expense Excess Tax Benefit from Share-based Compensation, Operating Activities Excess income tax benefit from share based compensation Changes in assets and liabilities: Accounts receivable 1 Accounts receivable Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Contract revenues in excess of billings Inventories Inventories Prepaid expenses and other current assets in operation Prepaid expenses and other current assets Accounts payable and accrued expenses Increase Decrease In Billings In Excess Of Cost Increase Decrease In Billings In Excess Of Cost Billings in excess of contract revenues Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Other noncurrent assets and liabilities NetCashProvidedByUsedInOperatingActivitiesContinuingOperations Net cash flows provided by (used in) operating activities of continuing operations Net cash flows provided by (used in) operating activities of continuing operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations Net cash flows used in operating activities of discontinued operations Net Cash Provided by (Used in) Operating Activities Cash provided by (used in) operating activities INVESTING ACTIVITIES: Purchases of property and equipment Purchases of property and equipment Dispositions of property and equipment Proceeds from dispositions of property and equipment Payments on vendor performance obligations Proceeds from Vendor Performance Obligations Payments on vendor performance obligations Payments on vendor performance obligations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations Net cash flows used in investing activities of continuing operations Net cash flows used in investing activities of continuing operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations Net cash flows used in investing activities of discontinued operations Net Cash Provided by (Used in) Investing Activities Cash used in investing activities FINANCING ACTIVITIES: Payment of Financing and Stock Issuance Costs Deferred financing fees Payments Related to Tax Withholding for Share-based Compensation Taxes paid on settlement of vested share awards Repayments of Long-term Debt Repayment of long term note payable Repayment of capital lease debt Repayments of equipment debt Proceeds from equipment debt Proceeds from equipment debt MinorityInterestDecreaseFromRedemptions Purchase of noncontrolling interest Exercise of options and purchases from employee stock plans Excess Tax Benefit from Share-based Compensation, Financing Activities Excess income tax benefit from share-based compensation Borrowings under revolving loans Repayments of revolving loans Repayments of revolving loans Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents Effect of foreign currency exchange rates on cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net decrease in cash and cash equivalents Supplemental Cash Flow Information Cash paid for interest Cash paid (refunded) for income taxes Non-cash Investing and Financing Activities Property and equipment purchased but not yet paid Purchase of noncontrolling interest in non cash investing and financing activies Purchase of noncontrolling interest in non cash Investing And Financing Activies Purchase of noncontrolling interest Basis of presentation BasisOfPresentationAndSignificantAccountingPoliciesTextBlock Basis of presentation Earnings per share [Abstract] Earnings Per Share Accounts Receivable And Contracts In Progress [Abstract] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Accounts Receivables And Contracts In Progress Accrued Expenses [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Long-term Debt [Abstract] Long-term Debt [Text Block] Long-Term Debt Fair Value Measurements [Abstract] Fair value measurements [Text Block] Fair Value Measurements Share-based compensation[Abstract] Share-based Compensation Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure Text Block Commitments And Contingencies Investments [Abstract] Investments [Table] Schedule of Equity Method Investments [Line Items] Investments Business Dispositions [Abstract] Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block] Business Combinations And Reorganizations Segment Information [Abstract] Segment Reporting Disclosure [Text Block] Segment Information Subsidiary Guarantors [Abstract] Subsidiary Guarantors [Text Block] Subsidiary Guarantors Earnings Per Share Basic Line Items Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Computations For Basic And Diluted Earnings Per Share Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule Of Accounts Receivable Components Of Contracts In Progress [Table Text Block] Components Of Contracts In Progress [Table Text Block] Components Of Contracts In Progress Schedule of Accrued Liabilities [Table Text Block] Accrued Expenses Schedule of Fair Values Of Financial Instruments and Nonfinancial Assets and Liabilities Measured (Table) (Text Block) Schedule Of Fair Values of financial instruments and nonfinancial assets and liabilities measured [Table Text Block] Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule Fair Value Measurements Balance Sheet Location Changes In Components Of Accumulated Other Comprehensive Income (Table) (Text Block) Changes In Components Of Accumulated other comprehensive loss (Table) Adjustments Reclassified From Accumulated Other Comprehensive Income To Earnings (Table) (TextBlock) Adjustments Reclassified From Accumulated Other Comprehensive Income To Earnings (Table) (TextBlock) Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementBalanceSheetAndAdditionalDisclosuresTextBlock Schedule Of Discontinued Operation Schedule of Segment Reporting Information, by Segment [Table Text Block] Segment Reporting By Segment Schedule of Condensed Balance Sheet [Table Text Block] Condensed Consolidating of Balance Sheet Schedule Of Condensed Consolidating Operations And Comprehensive Income (Table Text Block) Schedule Of Condensed Consolidating Operations And Comprehensive Income [Table TextBlock] Schedule Of Condensed Consolidating Operations And Comprehensive Income Condensed Cash Flow Statement [Table Text Block] Condensed Cash Flow Statement Nature Of Business And Summary Of Significant Accounting Policies [Table] Basis of presentation [Table] Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Nature Of Business And Summary Of Significant Accounting Policies [Line Items] Basis of presentation [Line Items] Equipment-Related Costs, Percentage Of Costs Of Contract Revenue Equipment-Related Costs, Percentage Of Costs Of Contract Revenue Average equipment-related costs of total costs of contract revenue Number of Reportable Segments Number of reportable segments Number of 0perating Segments Number of operating Segments Potentially dilutive stock options and restricted stock units Potentially dilutive stock options and restricted stock units Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Loss on discontinued operations, net of income taxes, attributable to Great Lakes Dredge & Dock Corporation Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Contract Receivable Type [Axis] Contract Receivable Type [Axis] Contract Receivable Type [Domain] Contract Receivable Type [Domain] Contract Receivable Type [Domain] Completed Contracts [Member] Completed Contracts [Member] Completed Contracts [Member] Contracts In Progress [Member] Contracts In Progress [Member] Contracts In Progress [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Receivable [Line Items] Contract Receivable Contracts Contract Receivable Retainage Retainage Accounts Receivable, Gross Allowance for Doubtful Accounts Receivable Allowance for doubtful accounts Accounts Receivable, Net Total accounts receivable-net Accounts Receivable, Noncurrent And Contract Receivable Retainage Accounts Receivable, Noncurrent And Contract Receivable Retainage Long-term accounts receivable and retainage Costs And Earnings In Excess Of Billings [Member] Costs And Earnings In Excess Of Billings [Member] Costs And Earnings In Excess Of Billings [Member] Billings In Excess Of Costs And Earnings [Member] Billings In Excess Of Costs And Earnings [Member] Billings In Excess Of Costs And Earnings [Member] Costs and earnings for contracts in progress. Costs And Earnings For Contracts In Progress Costs and earnings for contracts in progress Billings for contracts in progress. Billings For Contracts In Progress Amounts billed Costs and earnings in excess of billings for contracts in progress. Costs And Earnings In Excess Of Billings For Contracts In Progress Costs and earnings in excess of billings for contracts in progress Costs and earnings in excess of billings for completed contracts. Costs and Earnings In Excess Of Billings For Completed Contracts Costs and earnings in excess of billings for completed contracts Costs in Excess of Billings on Uncompleted Contracts or Programs Total contract revenues in excess of billings Billings in excess of costs and earnings:, Amounts billed Billings in excess of costs and earnings, Amounts billed Billings in excess of costs and earnings, Costs and earnings for contracts in progress Billings in excess of costs and earnings, Costs and earnings for contracts in progress Accrued Insurance, Current Insurance Accumulated deficit in joint ventures Accumulated deficit in joint ventures Employee-related Liabilities, Current Payroll and employee benefits Taxes Payable, Current Income and other taxes Interest Payable, Current Interest Fuel hedge contracts Fuel hedge contracts Percentage of completion adjustment Percentage of completion adjustment Other Accrued Liabilities, Current Other Schedule of Long-term Debt Instruments [Table] Interest Rate, Types [Axis] Interest Rate, Types [Axis] Interest Rate, Types [Domain] Interest Rate Types [Domain] Interest Rate, Types [Domain] LIBOR Rate [Member] Libor Rate [Member] LIBOR Rate [Member] Base Rate [Member] Base Rate [Member] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Multicurrency [Member] Multicurrency [Member] Multicurrency [Member] Swingline Loans [Member] Swingline Loans [Member] Swingline Loans [Member] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Term Loan Facility [Member] Term Loan Facility [Member] Term Loan Facility [Member] Debt Instrument [Line Items] Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, maximum borrowing capacity Line of credit facility optional increase capacity Line of credit facility optional increase capacity Debt Instrument, Description of Variable Rate Basis Revolving credit facility, interest rate description Debt Instrument, Basis Spread on Variable Rate Revolving credit facility, basis spread on variable rate Letters of Credit Outstanding, Amount Letters of credit outstanding Line of Credit Facility, Remaining Borrowing Capacity Letter of credit remaining borrowing capacity Debt Instrument, Face Amount Debt instrument, face amount Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Principal amount Borrowed aggregate principal amount Borrowed aggregate principal amount Redemption prices Redemption prices Term loan facility bear interest fixed rate Term loan facility bear interest fixed rate Debt Instrument, Interest Rate, Increase (Decrease) Term Loan number of years Term Loan number of years Net book value of related assets Net book value of related assets Secured promissory note which has an aggregate principal amount Secured promissory note which has an aggregate principal amount Secured promissory note accrues interest rate Secured promissory note accrues interest rate Long-term Debt, Excluding Current Maturities Other Financial Instruments [Member] Other Financial Instruments [Member] Other Financial Instruments [Member] Defined Benefit Plan Disclosure [Line Items] Derivative underlying hedge percent. Derivative Underlying Hedge Percent Derivative underlying hedge percent Derivative, Nonmonetary Notional Amount, Volume Derivative, Swap Type, Fixed Price Fixed price range Fair value hedge liabilities Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Senior notes interest rate Eligible Item or Group for Fair Value Option [Axis] Fair Value Option Eligible Item Or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Fuel Hedge Contracts [Member] Fuel Hedge Contracts [Member] Fuel Hedge Contracts [Member] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Inputs Level2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Net Asset (Liability) Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivatives, Fair Value [Line Items] OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax Cumulative translation adjustments-net of tax Reclassification of derivative losses to earnings-net of tax Reclassification of derivative losses (gains) to earnings-net of tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax Change in fair value of derivatives-net of tax Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated As Hedging Instrument [Member] Designated as Hedging Instrument [Member] Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Member] Other Current Assets [Member] Other Current Assets [Member] Derivative Asset, Fair Value, Gross Liability Derivative asset, fair value, gross liability Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Title of Individual [Axis] Title Of Individual With Relationship To Entity [Domain] Title of Individual with Relationship to Entity [Domain] Employees And Directors [Member] Employees And Directors [Member] Employees And Directors [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based compensation arrangement by share-based payment award, number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock units Commitments And Contingencies [Table] Commitments And Contingencies [Table] Gain Contingencies, Nature [Axis] Gain Contingency Nature [Domain] Gain Contingency, Nature [Domain] Projects Accounted For Discontinued Operations [Member] Projects Accounted For Discontinued Operations [Member] Projects Accounted For Discontinued Operations [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Bids bond range Bids bond range Outstanding performance bonds Outstanding performance bonds Revenue value remaining from outstanding performance bonds Revenue value remaining from outstanding performance bonds Warranty periods Warranty periods Proceeds from Lines of Credit Proceeds from Legal Settlements Gain (Loss) Related to Litigation Settlement Funds remitted Funds remitted Other current assets DisposalGroupIncludingDiscontinuedOperationRevenue Revenue DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax Loss before income taxes from discontinued operations DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax Income tax benefit Proceeds from Divestiture of Businesses Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Segment [Domain] Segment [Domain] Dredging [Member] Dredging [Member] Dredging [Member] Demolition [Member] Demolition [Member] Demolition [Member] Segment Reporting Information [Line Items] Legal Entity [Axis] Entity [Domain] Entity [Domain] Parent Company [Member] GLDD Corporation [Member] Owned Domestic Subsidiaries Percent Owned Domestic Subsidiaries Percent Schedule of Condensed Financial Statements [Table] Subsidiaries [Member] Subsidiaries [Member] Guarantor Subsidiaries [Member] Subsidiary Guarantors [Member] Non Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Consolidation Eliminations [Member] Eliminations [Member] Condensed Financial Statements, Captions [Line Items] Due from Affiliate, Current Receivables from affiliates Due from Affiliates RECEIVABLES FROM AFFILIATES Investments in subsidiaries. Investments in subsidiaries INVESTMENTS IN SUBSIDIARIES Due to Affiliate, Current Payables to affiliates Income (loss) from equity investments in subsidiaries. Income Loss From Equity Investments In Subsidiaries Equity in earnings (loss) of subsidiaries Income (loss) from continuing operations before income taxes Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income (loss) attributable to Great Lakes Dredge & Dock Corporation Net change in accounts with affiliates Net change in accounts with affiliates Net change in accounts with affiliates Net change in accounts with affiliates, in finance activities Net change in accounts with affiliates, in finance activities Capital contributions Capital contributions NetCashProvidedByUsedInFinancingActivitiesContinuingOperations Net cash flows provided by (used in) financing activities of continuing operations Long-term Debt Vessels and Ancillary Equipment [Member] Vessels And Ancillary Equipment [Member] Vessels and Ancillary Equipment [Member] Scenario [Axis] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Scenario Forecast [Member] Scenario, Forecast [Member] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] TerraSea Environmental Solutions [Member] Terrasea Environmental Solutions [Member] TerraSea Environmental Solutions [Member] Foreign [Member] Foreign [Member] Foreign [Member] Intersegment Revenues [Member] Intersegment Revenues [Member] Intersegment Revenues [Member]