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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities of Continuing Operations:    
Net income $ 20,859 $ 58,185
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations -    
Income from discontinued operations   (5,795)
Depreciation 41,170 39,398
Amortization of intangible assets 7,495 8,293
Equity in losses of unconsolidated affiliates 181  
Amortization of debt issuance costs 340 273
Gain on sale of property and equipment (107) (103)
Foreign currency loss 110 190
Provision for (recovery of) doubtful accounts (983) 578
Deferred income tax provision 2,716 712
Non-cash stock-based compensation 13,719 9,471
Tax impact of stock-based equity awards   (1)
Changes in operating assets and liabilities, net of non-cash transactions - (Increase) decrease in -    
Accounts and notes receivable 158,995 119,873
Costs and estimated earnings in excess of billings on uncompleted contracts (52,467) (63,488)
Inventories 4,537 (3,122)
Prepaid expenses and other current assets 1,826 (2,306)
Accounts payable and accrued expenses and other non-current liabilities (29,716) 29,211
Billings in excess of costs and estimated earnings on uncompleted contracts 35,938 (7,018)
Other, net (4,874) (4,723)
Net cash provided by operating activities of continuing operations 199,739 179,628
Cash Flows from Investing Activities of Continuing Operations:    
Proceeds from sale of property and equipment 5,089 1,282
Additions of property and equipment (47,695) (58,504)
Cash paid for acquisitions, net of cash acquired (39,675) (34,733)
Investments in and return of equity from unconsolidated affiliates (2,225) (809)
Cash received from (paid for) other investments, net 577 322
Cash withdrawn from restricted cash   214
Net cash used in investing activities of continuing operations (83,929) (92,228)
Cash Flows from Financing Activities of Continuing Operations:    
Borrowings under credit facility 654,416 147,456
Payments under credit facility (729,603) (103,943)
Payments on other long-term debt (4,855) (400)
Payments on short-term debt (4,711) (922)
Distributions to non-controlling interests   (2,503)
Tax impact of stock-based equity awards   1
Exercise of stock options 51 76
Repurchase of common stock   (182,000)
Net cash used in financing activities of continuing operations (84,702) (142,235)
Discontinued operations:    
Net cash provided by operating activities   9,599
Net cash used in investing activities (5,643) (7,664)
Net cash provided by (used in) discontinued operations (5,643) 1,935
Effect of foreign exchange rate changes on cash and cash equivalents 1,079 (2,081)
Net increase (decrease) in cash and cash equivalents 26,544 (54,981)
Cash and cash equivalents, beginning of period 128,771 190,515
Cash and cash equivalents, end of period 155,315 135,534
Supplemental disclosure of cash flow information:    
Interest paid related to continuing operations (2,441) (1,188)
Income taxes paid (6,486) (12,404)
Income tax refunds related to continuing operations 894 445
Discontinued Operations [Member]    
Supplemental disclosure of cash flow information:    
Income taxes paid $ (5,643) $ (205)