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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Cash Flows from Operating Activities of Continuing Operations:        
Net income $ 218,956 $ 100,015 $ 326,706 $ 244,107
Adjustments to reconcile net income to net cash provided by (used in) operating activities of continuing operations-        
Income from discontinued operations (173,212) (6,725) (193,109) (21,320)
Depreciation 40,954 36,485 121,382 103,239
Amortization of intangible assets 8,650 9,125 25,674 25,160
Equity in losses of unconsolidated affiliates     314 332
Amortization of debt issuance costs 273 273 819 821
Gain on sale of property and equipment (734) (890) (844) (1,991)
Foreign currency loss 843 381 1,556 797
Provision for (recovery of) doubtful accounts (645) 11 59 1,121
Provision for contract receivable   52,542   52,542
Non-cash portion of arbitration expense       10,518
Deferred income tax benefit (7,544) (13,215) (6,552) (13,760)
Non-cash stock-based compensation 9,523 7,397 28,708 27,249
Tax impact of stock-based equity awards (665) (1,185) (669) (1,429)
Changes in operating assets and liabilities, net of non-cash transactions - (Increase) decrease in -        
Accounts and notes receivable (59,739) (216,792) 77,913 (374,751)
Costs and estimated earnings in excess of billings on uncompleted contracts (11,828) (96,008) (78,597) (100,844)
Inventories (9,605) 1,058 (22,596) (5,723)
Prepaid expenses and other current assets 14,305 (201) 4,729 (22,687)
Accounts payable and accrued expenses and other non-current liabilities 60,333 142,070 111,779 39,866
Billings in excess of costs and estimated earnings on uncompleted contracts 20,950 33,886 6,381 23,515
Other, net (1,917) 2,121 (9,003) 6,199
Net cash provided by (used in) operating activities of continuing operations 108,898 50,348 394,650 (7,039)
Cash Flows from Investing Activities of Continuing Operations:        
Proceeds from sale of property and equipment 8,471 2,941 17,486 9,482
Additions of property and equipment (47,970) (67,577) (168,967) (187,586)
Cash paid for acquisitions, net of cash acquired (29,370) (81,828) (102,039) (161,411)
Investments in equity from unconsolidated affiliates, net (1,051) 176 (3,644) (2,868)
Cash received from (paid for) other investments, net (960) (614) 2,233 1,656
Cash withdrawn from restricted cash     214  
Cash paid for intangibles     (211)  
Net cash used in investing activities of continuing operations (70,880) (146,902) (254,928) (340,727)
Cash Flows from Financing Activities of Continuing Operations:        
Borrowings under credit facility 1,485,089 375,084 2,257,831 711,284
Payments under credit facility (1,342,807) (298,198) (1,975,491) (634,398)
Borrowings of other long-term debt   394   394
Payments on other long-term debt (656) (19,339) (2,015) (30,012)
Payments on short-term debt     (5,170)  
Distributions to non-controlling interests (1,500) (3,000) (6,503) (3,506)
Tax impact of stock-based equity awards 665 1,185 669 1,429
Exercise of stock options   200 354 1,101
Repurchase of common stock, including accelerated stock repurchases (1,175,293)   (1,529,572) (45,021)
Net cash provided by (used in) financing activities of continuing operations (1,034,502) 56,326 (1,259,897) 1,271
Discontinued operations:        
Net cash provided by operating activities 1,311 14,952 22,342 44,562
Net cash provided by (used in) investing activities 980,880 (12,295) 959,699 (39,099)
Net cash provided by discontinued operations 982,191 2,657 982,041 5,463
Effect of foreign exchange rate changes on cash and cash equivalents (1,940) (7,218) (3,187) (3,586)
Net decrease in cash and cash equivalents (16,233) (44,789) (141,321) (344,618)
Cash and cash equivalents, beginning of period 65,427 188,948 190,515 488,777
Cash and cash equivalents, end of period 49,194 144,159 49,194 144,159
Supplemental disclosure of cash flow information:        
Interest paid (1,721) (969) (4,331) (2,338)
Income taxes paid (56,057) (15,805) (106,542) (176,851)
Income tax refunds $ 7,286 $ 5,363 $ 18,024 $ 6,655