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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Cash Flows from Operating Activities:        
Net income $ 100,015 $ 98,409 $ 244,107 $ 249,992
Adjustments to reconcile net income to net cash provided by operating activities -        
Depreciation 40,828 33,873 115,689 98,793
Amortization of intangible assets 9,538 7,026 26,398 17,406
Amortization of debt issuance costs 273 218 821 654
Amortization of deferred revenues (2,417) (2,652) (7,787) (8,169)
Gain on sale of property and equipment (873) (859) (1,975) (1,512)
Foreign currency loss 381 1,303 797 2,247
Provision for doubtful accounts 11 170 1,121 1,832
Provision for contract receivable 52,542   52,542  
Non-cash portion of arbitration expense     10,518  
Deferred income tax benefit (10,613) (15,481) (4,865) (10,507)
Non-cash stock-based compensation 7,772 7,669 28,454 27,747
Tax impact of stock-based equity awards (1,185) (229) (1,429) (2,797)
Changes in operating assets and liabilities, net of non-cash transactions -        
Accounts and notes receivable (220,012) (126,633) (369,434) (97,474)
Costs and estimated earnings in excess of billings on uncompleted contracts (73,374) (792) (80,829) (66,460)
Inventories 1,058 5,396 (5,723) 2,500
Prepaid expenses and other current assets (127) (22,947) (23,050) (7,519)
Accounts payable and accrued expenses and other non-current liabilities 147,387 95,000 45,478 17,470
Billings in excess of costs and estimated earnings on uncompleted contracts 10,989 (3,771) 618 12,243
Other, net 1,926 7,492 6,072 8,654
Net cash provided by operating activities 64,119 83,192 37,523 245,100
Cash Flows from Investing Activities:        
Proceeds from sale of property and equipment 2,926 4,508 9,476 8,607
Additions of property and equipment (79,857) (51,074) (226,679) (213,240)
Cash paid for acquisitions, net of cash acquired (81,828) (123,759) (161,411) (124,736)
Investments in and return of equity from unconsolidated affiliates 176 (1,707) (2,868) (11,177)
Cash received from (paid for) other investments 567 994 1,656 (12,332)
Cash withdrawn from restricted cash   36,482   36,482
Net cash used in investing activities (158,016) (134,556) (379,826) (316,396)
Cash Flows from Financing Activities:        
Borrowings under credit facility 375,084   711,284  
Payments under credit facility (298,198)   (634,398)  
Borrowings of other long-term debt 394   394  
Payments on other long-term debt (19,339) (227) (30,012) (227)
Distributions to non-controlling interests (3,000) (2,503) (3,506) (11,815)
Tax impact of stock-based equity awards 1,185 229 1,429 2,797
Exercise of stock options 200 49 1,101 872
Repurchase of common stock     (45,021)  
Net cash provided by (used in) financing activities 56,326 (2,452) 1,271 (8,373)
Effect of foreign exchange rate changes on cash and cash equivalents (7,218) (144) (3,586) (5,879)
Net decrease in cash and cash equivalents (44,789) (53,960) (344,618) (85,548)
Cash and cash equivalents, beginning of period 188,948 363,113 488,777 394,701
Cash and cash equivalents, end of period 144,159 309,153 144,159 309,153
Supplemental disclosure of cash flow information:        
Interest paid (969) (267) (2,338) (996)
Income taxes paid (15,805) (36,557) (176,851) (193,947)
Income tax refunds $ 5,363 $ 297 $ 6,655 $ 639