Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Cost	$ 20,525	$ 9,390
Accumulated Amortization	(9,218)	(8,040)
Net Carrying Amount	11,307	1,350
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	9,010	4,010
Accumulated Amortization	(4,542)	(3,892)
Net Carrying Amount	4,468	118
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	8,985	3,530
Accumulated Amortization	(2,751)	(2,364)
Net Carrying Amount	6,234	1,166
Non-Competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,640	1,260
Accumulated Amortization	(1,302)	(1,214)
Net Carrying Amount	338	46
Tradenames - Finite Life [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	890	590
Accumulated Amortization	(623)	(570)
Net Carrying Amount	$ 267	$ 20