Business Combinations, Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 87,554	$ 71,694
Accumulated Amortization	(34,821)	(24,715)
Net Carrying Amount	52,733	46,979
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	64,816	51,598
Accumulated Amortization	(24,215)	(16,836)
Net Carrying Amount	40,601	34,762
Leasehold benefits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,789	2,927
Accumulated Amortization	(2,109)	(2,004)
Net Carrying Amount	680	923
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,234	10,814
Accumulated Amortization	(4,363)	(2,402)
Net Carrying Amount	7,871	8,412
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,045	1,365
Accumulated Amortization	(1,451)	(1,323)
Net Carrying Amount	594	42
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,670	4,990
Accumulated Amortization	(2,683)	(2,150)
Net Carrying Amount	$ 2,987	$ 2,840