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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities:      
Net income $ 421,309 $ 322,656 $ 144,416
Income from discontinued operations   (16,935) (14,004)
Adjustments to reconcile net income to net cash provided by operating activities -      
Depreciation 134,110 120,303 109,874
Amortization of intangible assets 27,515 37,691 29,039
Equity in earnings of unconsolidated affiliates, including gain on sale of investment (112,744) (2,084)  
Amortization of debt issuance costs 1,081 904 901
Amortization of deferred revenues (9,025) (10,149) (11,415)
(Gain) loss on sale of property and equipment (2,448) (970) 897
Foreign currency loss 2,179 691 1,196
Provision for doubtful accounts 3,236 3,693 1,163
Deferred income tax provision (benefit) (16,470) 22,533 556
Non-cash stock-based compensation 35,876 25,990 19,480
Tax impact of stock-based equity awards (3,723) (297) (1,365)
Changes in operating assets and liabilities, net of non-cash transactions -      
Accounts and notes receivable (74,249) (341,825) (270,248)
Costs and estimated earnings in excess of billings on uncompleted contracts (47,281) (150,486) (64,478)
Inventories 5,986 26,435 (13,581)
Prepaid expenses and other current assets (7,505) (12,599) 10,490
Accounts payable and accrued expenses and other non-current liabilities 36,015 123,143 201,890
Billings in excess of costs and estimated earnings on uncompleted contracts 48,849 26,624 63,066
Other, net 3,881 (8,479) (3,799)
Net cash provided by operating activities of continuing operations 446,592 166,839 204,078
Cash Flows from Investing Activities:      
Proceeds from sale of property and equipment 14,794 12,362 9,142
Additions of property and equipment (263,558) (209,445) (162,285)
Cash paid for acquisitions, net of cash acquired (283,837) (68,727) (79,660)
Investments in and return on equity from unconsolidated affiliates 186,185 (53,750) (35,000)
Cash received from (paid for) other investments (10,032)   (4,000)
Cash withdrawn from restricted cash 36,482    
Cash paid for other intangibles   (1,541) (455)
Net cash used in investing activities of continuing operations (319,966) (321,101) (272,258)
Cash Flows from Financing Activities:      
Borrowings under credit facility 341,730 1,052,700  
Payments under credit facility (341,730) (1,052,700)  
Proceeds from other long-term debt 23   4,343
Payments on other long-term debt (556) (56) (5,680)
Debt issuance and amendment costs (3,244)   (4,127)
Distributions to noncontrolling interests (17,625) (17,970) (5,954)
Tax impact of stock-based equity awards 3,723 297 1,365
Exercise of stock options 1,028 2,385 867
Repurchase of common stock     (149,547)
Net cash used in financing activities of continuing operations (16,651) (15,344) (158,733)
Discontinued operations:      
Net cash provided by (used in) operating activities   (60,622) 13,952
Net cash provided by (used in) investing activities   307,522 (8,959)
Net cash provided by discontinued operations   246,900 4,993
Effect of foreign exchange rate changes on cash and cash equivalents (15,899) 2,058 (1,952)
Net increase (decrease) in cash and cash equivalents 94,076 79,352 (223,872)
Cash and cash equivalents, beginning of year 394,701 315,349 539,221
Cash and cash equivalents, end of year 488,777 394,701 315,349
Supplemental disclosure of cash flow information:      
Interest paid (1,586) (2,734) (701)
Income taxes paid (253,175) (155,494) (13,306)
Income tax refunds $ 1,826 $ 4,106 $ 6,502