Acquisitions - Summary of Identifiable Intangible Asset Amortized on Straight-Line Basis Over Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Jul. 08, 2010
Stonewood acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 11,199
Estimated Weighted Average Life	6 years
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	9,026
Estimated Weighted Average Life	5 years
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	1,977
Estimated Weighted Average Life	10 years
Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 196
Estimated Weighted Average Life	5 years