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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash Flows from Operating Activities of Continuing Operations:      
Net income $ 321,824 $ 315,082 $ 421,309
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations -      
Income from discontinued operations (190,621) (27,490) (29,864)
Depreciation 162,845 141,106 118,830
Amortization of intangible assets 34,848 34,257 25,865
Asset impairment charges 58,451    
Equity in (earnings) losses of unconsolidated affiliates, including gain on sale of investment 466 332 (112,744)
Amortization of debt issuance costs 1,251 1,094 1,081
Gain on sale of property and equipment (2,773) (1,803) (2,464)
Foreign currency loss 2,490 1,244 2,179
Provision for doubtful accounts 224 1,411 3,236
Provision for contract receivable   102,460  
Non-cash portion of arbitration expense   10,518  
Deferred income tax provision (benefit) (19,403) 22,906 (25,713)
Non-cash stock-based compensation 36,939 37,449 34,381
Tax impact of stock-based equity awards (669) (1,563) (3,723)
Changes in operating assets and liabilities, net of non-cash transactions - (Increase) decrease in -      
Accounts and notes receivable 150,470 (239,159) (69,599)
Costs and estimated earnings in excess of billings on uncompleted contracts (49,358) (73,443) (42,273)
Inventories (33,524) (4,025) 5,986
Prepaid expenses and other current assets 5,899 (35,493) (10,329)
Accounts payable and accrued expenses and other non-current liabilities (2,486) (60,829) 19,254
Billings in excess of costs and estimated earnings on uncompleted contracts 153,017 28,596 38,708
Other, net (11,707) (4,908) (3,562)
Net cash provided by operating activities of continuing operations 618,183 247,742 370,558
Cash Flows from Investing Activities of Continuing Operations:      
Proceeds from sale of property and equipment 26,178 14,448 14,789
Additions of property and equipment (209,968) (247,216) (221,946)
Cash paid for acquisitions, net of cash acquired (112,914) (262,218) (283,837)
Investments in and return of equity from unconsolidated affiliates (6,074) (3,127) 186,185
Cash received from (paid for) other investments, net (4,338) 6,214 (10,032)
Cash withdrawn from restricted cash 214 3,565 36,482
Cash paid for intangibles (211) (252)  
Net cash used in investing activities of continuing operations (307,113) (488,586) (278,359)
Cash Flows from Financing Activities of Continuing Operations:      
Borrowings under credit facility 3,349,385 938,047 341,730
Payments under credit facility (2,935,752) (866,224) (341,730)
Borrowings of other long-term debt   394 23
Payments on other long-term debt (2,683) (30,448) (556)
Borrowings of short-term debt 4,872 5,056  
Payments on short-term debt (5,170)    
Debt issuance and amendment costs (3,795)   (3,244)
Contributions from non-controlling interests 2,313    
Distributions to non-controlling interests (21,228) (14,432) (17,625)
Tax impact of stock-based equity awards 669 1,563 3,723
Exercise of stock options 372 1,179 1,028
Repurchase of common stock, including accelerated stock repurchases (1,606,361) (93,482)  
Net cash used in financing activities of continuing operations (1,217,378) (58,347) (16,651)
Discontinued operations:      
Net cash provided by operating activities 22,342 63,082 76,034
Net cash provided by provided by (used in) investing activities 825,376 (54,280) (41,607)
Net cash provided by discontinued operations 847,718 8,802 34,427
Effect of foreign exchange rate changes on cash and cash equivalents (3,154) (7,873) (15,899)
Net increase (decrease) in cash and cash equivalents (61,744) (298,262) 94,076
Cash and cash equivalents, beginning of year 190,515 488,777 394,701
Cash and cash equivalents, end of year 128,771 190,515 488,777
Supplemental disclosure of cash flow information:      
Interest paid related to continuing operations (7,087) (3,533) (1,586)
Income taxes paid (130,921) (223,901) (244,550)
Income tax refunds related to continuing operations 23,788 7,376 1,826
Discontinued Operations [Member]      
Supplemental disclosure of cash flow information:      
Income taxes paid $ (144,076) $ (5,286) $ (8,625)