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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows - operating activities:      
Net income including noncontrolling interests $ 227,193 $ 182,153 $ 172,507
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 39,915 38,881 36,294
Amortization of identifiable intangible assets 48,594 40,908 37,895
Provision for doubtful accounts 7,264 6,194 2,853
Deferred income taxes (53,358) (8,108) (10,300)
Gain on sale of property, plant and equipment (1,846) (330) (248)
Excess tax benefits from share-based compensation (1,616) (2,546) (1,663)
Equity income from unconsolidated entities (864) (1,569) (2,883)
Non-cash expense for amortization of debt issuance costs 1,186 1,354 1,307
Non-cash expense (income) from contingent consideration arrangements 317 0 (464)
Non-cash expense for impairment of goodwill and identifiable intangible assets 57,819 2,428 0
Non-cash share-based compensation expense 9,939 8,902 8,801
Non-cash income from changes in unrecognized tax benefits (5,641) (759) (317)
Distributions from unconsolidated entities 5,506 1,247 3,352
Changes in operating assets and liabilities, excluding the effect of businesses acquired:      
Increase in accounts receivable (80,514) (98,773) (115,303)
(Increase) decrease in inventories (4,936) 954 9,733
Decrease (increase) in costs and estimated earnings in excess of billings on uncompleted contracts 12,433 (7,851) (12,837)
Increase in accounts payable 54,910 13,141 25,440
Increase in billings in excess of costs and estimated earnings on uncompleted contracts 24,695 57,244 58,614
Increase in accrued payroll and benefits and other accrued expenses and liabilities 24,017 22,659 37,122
Changes in other assets and liabilities, net 1,121 8,432 16,763
Net cash provided by operating activities 366,134 264,561 266,666
Cash flows - investing activities:      
Payments for acquisitions of businesses, net of cash acquired (107,223) (232,947) (28,195)
Proceeds from sale of property, plant and equipment 4,014 2,023 3,847
Purchase of property, plant and equipment (34,684) (39,648) (35,460)
Investments in and advances to unconsolidated entities (675) (99) 0
Distributions from unconsolidated entities 475 0 0
Net cash used in investing activities (138,093) (270,671) (59,808)
Cash flows - financing activities:      
Proceeds from revolving credit facility 0 220,000 0
Repayments of revolving credit facility (100,000) (95,000) 0
Borrowings from long-term debt 0 400,000 0
Repayments of long-term debt and debt issuance costs (15,202) (417,990) (17,514)
Repayments of capital lease obligations (1,445) (1,384) (2,737)
Dividends paid to stockholders (18,971) (19,454) (20,095)
Repurchase of common stock (93,166) (94,221) (104,330)
Proceeds from exercise of stock options 0 741 3,836
Taxes paid related to net share settlements of equity awards (3,462) (4,225) (3,866)
Issuance of common stock under employee stock purchase plan 4,793 4,814 4,223
Payments for contingent consideration arrangements (1,017) 0 (403)
Distributions to noncontrolling interests 0 (2,710) (10,250)
Excess tax benefits from share-based compensation 0 0 1,663
Net cash used in financing activities (228,470) (9,429) (149,473)
Effect of exchange rate changes on cash and cash equivalents 3,242 (6,675) (2,610)
Increase (decrease) in cash and cash equivalents 2,813 (22,214) 54,775
Cash and cash equivalents at beginning of year 464,617 486,831 432,056
Cash and cash equivalents at end of period $ 467,430 $ 464,617 $ 486,831