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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flows from Operating Activities:    
Net income $ 58,648 $ 76,857
Adjustments to reconcile net income to net cash provided by (used in) operating activities -    
Depreciation 36,865 31,880
Amortization of intangible assets 8,245 5,301
Amortization of debt issuance costs 275 218
Amortization of deferred revenues (2,746) (2,505)
Gain on sale of property and equipment (305) (282)
Foreign currency (gain) loss (266) 502
Provision for doubtful accounts 48 1,508
Non-cash portion of arbitration expense 10,518  
Deferred income tax provision (benefit) 8,086 (1,122)
Non-cash stock-based compensation 10,298 8,036
Tax impact of stock-based equity awards (123)  
Changes in operating assets and liabilities, net of non-cash transactions -    
Accounts and notes receivable (61,480) 30,843
Costs and estimated earnings in excess of billings on uncompleted contracts (46,946) (65,030)
Inventories (1,923) 497
Prepaid expenses and other current assets (368) 13,548
Accounts payable and accrued expenses and other non-current liabilities (50,999) (47,634)
Billings in excess of costs and estimated earnings on uncompleted contracts (31,632) (10,504)
Other, net 3,272 2,019
Net cash provided by (used in) operating activities (60,533) 44,132
Cash Flows from Investing Activities:    
Proceeds from sale of property and equipment 2,493 1,544
Additions of property and equipment (71,418) (57,637)
Cash paid for acquisitions, net of cash acquired (76,368) (977)
Investments in and return on equity from unconsolidated affiliates   (8,545)
Cash received from (paid for) other investments 259  
Net cash used in investing activities (145,034) (65,615)
Cash Flows from Financing Activities:    
Borrowings under credit facility 2,370  
Payments under credit facility (2,370)  
Payments on other long-term debt (10,293)  
Distributions to noncontrolling interests (500) (5,454)
Tax impact of stock-based equity awards 123  
Exercise of stock options 424 497
Net cash used in financing activities (10,246) (4,957)
Effect of foreign exchange rate changes on cash and cash equivalents 376 (1,642)
Net decrease in cash and cash equivalents (215,437) (28,082)
Cash and cash equivalents, beginning of period 488,777 394,701
Cash and cash equivalents, end of period 273,340 366,619
Supplemental disclosure of cash flow information:    
Interest paid (1,268) (462)
Income taxes paid (87,712) (91,581)
Income tax refunds $ 238 $ 6