Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 487,145	$ 469,748
Accumulated Amortization	(283,889)	(264,674)
Intangible Assets, Net	$ 203,256	205,074
Remaining Weighted Average Amortization Period in Years	10 years 7 months 6 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 247,198	236,731
Accumulated Amortization	(101,744)	(90,840)
Intangible Assets, Net	$ 145,454	145,891
Remaining Weighted Average Amortization Period in Years	9 years 1 month 6 days
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 133,623	130,818
Accumulated Amortization	(131,086)	(126,954)
Intangible Assets, Net	$ 2,537	3,864
Remaining Weighted Average Amortization Period in Years	9 months 18 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 54,547	51,192
Accumulated Amortization	(11,313)	(9,525)
Intangible Assets, Net	$ 43,234	41,667
Remaining Weighted Average Amortization Period in Years	18 years
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 29,280	28,560
Accumulated Amortization	(24,890)	(23,507)
Intangible Assets, Net	$ 4,390	5,053
Remaining Weighted Average Amortization Period in Years	3 years 3 months 18 days
Patented Rights and Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 22,497	22,447
Accumulated Amortization	(14,856)	(13,848)
Intangible Assets, Net	$ 7,641	$ 8,599
Remaining Weighted Average Amortization Period in Years	4 years 6 months