Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 56,613	$ 57,455
Accumulated Amortization	8,372	6,245
Net Carrying Amount	48,241	51,210
Trademarks and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,006	879
Accumulated Amortization	177	140
Net Carrying Amount	829	739
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,095	35,769
Accumulated Amortization	6,335	4,655
Net Carrying Amount	28,760	31,114
Covenant not-to-compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	968	956
Accumulated Amortization	235	135
Net Carrying Amount	733	821
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,544	19,851
Accumulated Amortization	1,625	1,315
Net Carrying Amount	$ 17,919	$ 18,536