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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash Flows from Operating Activities:        
Net income $ 98,409 $ 100,856 $ 249,992 $ 220,647
Income from discontinued operations   (12,770)   (20,299)
Adjustments to reconcile net income to net cash provided by (used in) operating activities-        
Depreciation 33,873 30,713 98,793 89,115
Amortization of intangible assets 7,026 10,290 17,406 28,781
Equity in earnings of unconsolidated affiliates   (1,308)   (1,308)
Amortization of debt issuance costs 218 228 654 678
Amortization of deferred revenues (2,652) (2,523) (8,169) (7,663)
Gain on sale of property and equipment (859) (187) (1,512) (634)
Foreign currency loss 1,303 243 2,247 617
Provision for doubtful accounts 170 468 1,832 2,827
Deferred income tax provision (benefit) (15,481) 12,485 (10,507) 22,137
Non-cash stock-based compensation 7,669 6,634 27,747 20,120
Tax impact of stock-based equity awards (229) 66 (2,797) 24
Changes in operating assets and liabilities, net of non-cash transactions- (Increase) decrease in-        
Accounts and notes receivable (126,633) (272,380) (97,474) (309,551)
Costs and estimated earnings in excess of billings on uncompleted contracts (792) (23,853) (66,460) (163,143)
Inventories 5,396 (1,137) 2,500 21,321
Prepaid expenses and other current assets (22,947) (27,486) (7,519) (17,305)
Increase (decrease) in-        
Accounts payable and accrued expenses and other non-current liabilities 95,000 134,499 17,470 127,542
Billings in excess of costs and estimated earnings on uncompleted contracts (3,771) 3,834 12,243 (15,026)
Other, net 7,492 (5,191) 8,654 (7,265)
Net cash provided by (used in) operating activities of continuing operations 83,192 (46,519) 245,100 (8,385)
Cash Flows from Investing Activities:        
Proceeds from sale of property and equipment 4,508 2,107 8,607 8,976
Additions of property and equipment (51,074) (67,929) (213,240) (148,643)
Cash paid for acquisitions, net of cash acquired (123,759)   (124,736) (68,727)
Investments in unconsolidated affiliates (1,707)   (11,177) (53,750)
Cash received from (paid for) other investments 994   (12,332)  
Cash withdrawn from restricted cash 36,482   36,482  
Cash paid for other intangibles   (1,541)   (1,541)
Net cash used in investing activities of continuing operations (134,556) (67,363) (316,396) (263,685)
Cash Flows from Financing Activities:        
Borrowings under credit facility   425,540   775,160
Payments under credit facility   (339,540)   (650,160)
Payments on other long-term debt (227) (14) (227) (47)
Distributions to noncontrolling interests (2,503) (6,733) (11,815) (12,970)
Tax impact of stock-based equity awards 229 (66) 2,797 (24)
Exercise of stock options 49 649 872 1,573
Net cash provided by (used in) financing activities of continuing operations (2,452) 79,836 (8,373) 113,532
Discontinued operations:        
Net cash used in operating activities   (13,252)   (21,325)
Net cash used in investing activities   (2,908)   (10,907)
Net cash used in discontinued operations   (16,160)   (32,232)
Effect of foreign exchange rate changes on cash and cash equivalents (144) 5,547 (5,879) 3,630
Net decrease in cash and cash equivalents (53,960) (44,659) (85,548) (187,140)
Cash and cash equivalents, beginning of period 363,113 172,868 394,701 315,349
Cash and cash equivalents, end of period 309,153 128,209 309,153 128,209
Cash (paid) received during the period for-        
Interest paid (267) (752) (996) (1,532)
Income taxes paid (36,557) (40,255) (193,947) (111,179)
Income tax refunds $ 297 $ 384 $ 639 $ 2,677