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Disclosure - Accounts Receivable And Contracts In Progress (Components Of Contracts In Progress) (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - Accrued Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 40705 - Disclosure - Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Income Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document And Entity Information link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00305 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Condensed Consolidated Statements Of Equity link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - Basis of presentation link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Earnings per share link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Accounts Receivable And Contracts In Progress link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Accrued Expenses link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Long-term Debt link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - Impairment of Goodwill link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - Share-Based Compensation link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - Commitments And Contingencies link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - Business Dispositions link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - Subsidiary Guarantors link:presentationLink link:calculationLink link:definitionLink 20101 - Disclosure - Basis of presentation link:presentationLink link:calculationLink link:definitionLink 30203 - Disclosure - Earnings per share (Tables) link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - Accounts Receivable And Contracts In Progress (Tables) link:presentationLink link:calculationLink link:definitionLink 30401 - Disclosure - Accrued Expenses (Tables) link:presentationLink link:calculationLink link:definitionLink 30601 - Disclosure - Impairment Of Goodwill (Tables) link:presentationLink link:calculationLink link:definitionLink 30701 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 31103 - Disclosure - Business Dispositions (Tables) link:presentationLink link:calculationLink link:definitionLink 31201 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 31301 - Disclosure - Subsidiary Guarantors (Tables) link:presentationLink link:calculationLink link:definitionLink 40101 - Disclosure - Basis Of Presentation (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - Earnings per share (Narrative) (Detail) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - Long-term debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - Impairment Of Goodwill (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - Impairment Of Goodwill (Change In The Carrying Amount Of Goodwill) (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - Fair Value Measurements (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40702 - Disclosure - Fair Value Measurements (Fair Value Measurements At Reporting Date Using) (Details) link:presentationLink link:calculationLink link:definitionLink 40703 - Disclosure - Fair Value Measurements (Schedule of Balance Sheet Location Fuel Hedge Contracts) (Details) link:presentationLink link:calculationLink link:definitionLink 40704 - Disclosure - Fair Value Measurements (Fair Value Measurements Using Significant Unobservable) (Details) link:presentationLink link:calculationLink link:definitionLink 40706 - Disclosure - Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprohensive Income (Loss) To Earnings) (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - Share-Based Compensation (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - Commitments And Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - Investment (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - Business Dispositions (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - Segment Information (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41202 - Disclosure - Segment Information (Segment Reporting By Segment) (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - Subsidiary Guarantors (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - Subsidiary Guarantors (Condensed Consolidated Balance Sheets) (Details) link:presentationLink link:calculationLink link:definitionLink 41303 - Disclosure - Subsidiary Guarantors (Condensed Consolidated Statement Operations And Comprehensive Income) (Details) link:presentationLink link:calculationLink link:definitionLink 41304 - Disclosure - Subsidiary Guarantors (Condensed Consolidated of Cash Flow) (Details) link:presentationLink link:calculationLink link:definitionLink