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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows - operating activities:      
Net income including noncontrolling interests $ 172,507 $ 173,427 $ 127,354
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 36,294 36,524 36,310
Amortization of identifiable intangible assets 37,895 37,966 31,028
Provision for doubtful accounts 2,853 2,918 3,533
Deferred income taxes (10,300) 5,748 11,857
Loss on sale of subsidiary 0 608 0
Gain on sale of building 0 (11,749) 0
Gain on sale of property, plant and equipment (248) (4,920) (903)
Excess tax benefits from share-based compensation (1,663) (8,264) (4,624)
Equity income from unconsolidated entities (2,883) (1,440) (1,048)
Non-cash expense for amortization of debt issuance costs 1,307 1,307 1,497
Non-cash (income) expense from contingent consideration arrangements (464) 606 (6,793)
Non-cash expense for impairment of identifiable intangible assets 0 1,471 0
Non-cash share-based compensation expense 8,801 8,121 6,943
Non-cash (income) expense from changes in unrecognized income tax benefits (317) 2,143 (10,539)
Distributions from unconsolidated entities 3,352 1,767 679
Changes in operating assets and liabilities, excluding the effect of businesses acquired:      
(Increase) decrease in accounts receivable (115,303) 27,409 (3,221)
Decrease (increase) in inventories 9,733 5,269 (865)
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts (12,837) (13,010) 2,807
Increase (decrease) in accounts payable 25,440 (25,122) (12,904)
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts 58,614 (11,868) (2,793)
Increase (decrease) in accrued payroll and benefits and other accrued expenses and liabilities 37,122 32,340 (14,761)
Changes in other assets and liabilities, net 16,763 (14,594) (13,488)
Net cash provided by operating activities 266,666 246,657 150,069
Cash flows - investing activities:      
Payments for acquisitions of businesses, net of cash acquired (28,195) 0 (454,671)
Proceeds from sale of subsidiary 0 1,108 0
Proceeds from sale of building 0 11,885 0
Proceeds from sale of property, plant and equipment 3,847 7,239 2,930
Purchase of property, plant and equipment (35,460) (38,035) (35,497)
Investments in and advances to unconsolidated entities and joint ventures 0 (3,865) (800)
Maturity of short-term investments 0 0 4,616
Net cash used in investing activities (59,808) (21,668) (483,422)
Cash flows - financing activities:      
Proceeds from revolving credit facility 0 0 250,000
Repayments of revolving credit facility 0 0 (400,000)
Borrowings from long-term debt 0 0 350,000
Repayments of long-term debt and debt issuance costs (17,514) (17,454) (3,013)
Repayments of capital lease obligations (2,737) (1,715) (1,692)
Dividends paid to stockholders (20,095) (21,293) (12,080)
Repurchase of common stock (104,330) (201,994) (26,070)
Proceeds from exercise of stock options 3,836 6,858 5,172
Payments to satisfy minimum tax withholding (3,866) (1,481) (927)
Issuance of common stock under employee stock purchase plan 4,223 3,615 2,854
Payments for contingent consideration arrangements (403) 0 (537)
Distributions to noncontrolling interests (10,250) (4,750) (1,300)
Excess tax benefits from share-based compensation 1,663 8,264 4,624
Net cash (used in) provided by financing activities (149,473) (229,950) 167,031
Effect of exchange rate changes on cash and cash equivalents (2,610) (2,796) 832
Increase (decrease) in cash and cash equivalents 54,775 (7,757) (165,490)
Cash and cash equivalents at beginning of year 432,056 439,813 605,303
Cash and cash equivalents at end of period $ 486,831 $ 432,056 $ 439,813