Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Cost	$ 12,212	$ 9,390
Accumulated Amortization	(2,566)	(8,040)
Net Carrying Amount	9,646	1,350
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	5,770	4,010
Accumulated Amortization	(1,731)	(3,892)
Net Carrying Amount	4,039	118
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	5,692	3,530
Accumulated Amortization	(633)	(2,364)
Net Carrying Amount	5,059	1,166
Non-Competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	380	1,260
Accumulated Amortization	(74)	(1,214)
Net Carrying Amount	306	46
Tradenames - Finite Life [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	370	590
Accumulated Amortization	(128)	(570)
Net Carrying Amount	$ 242	$ 20