Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 484,336	$ 469,748
Accumulated Amortization	(297,313)	(264,674)
Intangible Assets, Net	$ 187,023	205,074
Remaining Weighted Average Amortization Period in Years	10 years 4 months 24 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 244,329	236,731
Accumulated Amortization	(110,640)	(90,840)
Intangible Assets, Net	$ 133,689	145,891
Remaining Weighted Average Amortization Period in Years	8 years 8 months 12 days
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 133,592	130,818
Accumulated Amortization	(132,441)	(126,954)
Intangible Assets, Net	$ 1,151	3,864
Remaining Weighted Average Amortization Period in Years	1 year 3 months 18 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 54,723	51,192
Accumulated Amortization	(12,855)	(9,525)
Intangible Assets, Net	$ 41,868	41,667
Remaining Weighted Average Amortization Period in Years	17 years 8 months 12 days
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 29,212	28,560
Accumulated Amortization	(25,546)	(23,507)
Intangible Assets, Net	$ 3,666	5,053
Remaining Weighted Average Amortization Period in Years	3 years 1 month 6 days
Patented Rights and Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 22,480	22,447
Accumulated Amortization	(15,831)	(13,848)
Intangible Assets, Net	$ 6,649	$ 8,599
Remaining Weighted Average Amortization Period in Years	4 years 2 months 12 days