Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 105,417	$ 71,564
Accumulated Amortization	21,442	13,166
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,456	1,429
Accumulated Amortization	1,455	1,427
Employment Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	653	693
Accumulated Amortization	572	433
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	15,583	8,317
Accumulated Amortization	3,222	2,290
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	79,104	58,617
Accumulated Amortization	15,355	8,959
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,111	1,118
Accumulated Amortization	201	34
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,390	1,390
Accumulated Amortization	127	$ 23
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	6,120
Accumulated Amortization	$ 510