Intangible Assets - Schedule of Carrying Amount of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	$ 552,704	$ 553,393
Intangible assets, Gross	668,441	669,201
Finite-lived intangible assets, Accumulated Amortization	(277,232)	(251,377)
Finite-lived intangible assets, Net	275,472	302,016
Intangible assets, net	391,209	417,824
Tradenames [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross	115,737	115,808
Indefinite-lived intangible assets, Net	115,737	115,808
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	404,549	405,021
Finite-lived intangible assets, Accumulated Amortization	(145,313)	(128,510)
Finite-lived intangible assets, Net	259,236	276,511
Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	27,802	27,832
Finite-lived intangible assets, Accumulated Amortization	(26,170)	(23,442)
Finite-lived intangible assets, Net	1,632	4,390
Tradenames [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	24,323	24,505
Finite-lived intangible assets, Accumulated Amortization	(19,974)	(18,513)
Finite-lived intangible assets, Net	4,349	5,992
Backlog [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	95,010	95,015
Finite-lived intangible assets, Accumulated Amortization	(85,250)	(80,447)
Finite-lived intangible assets, Net	9,760	14,568
Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	1,020	1,020
Finite-lived intangible assets, Accumulated Amortization	(525)	(465)
Finite-lived intangible assets, Net	$ 495	$ 555