Goodwill and Amortizable Intangible Assets - Net Consolidated Balance of Amortizable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified			9 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Customer Relationships [Member]	Sep. 30, 2013 Acquired Technology [Member]	Sep. 30, 2013 Non-compete Agreements [Member]	Sep. 30, 2013 Trademarks [Member]	Sep. 30, 2013 Minimum [Member] Acquired Technology [Member]	Sep. 30, 2013 Maximum [Member] Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortizable intangible assets	$ 26,584	$ 30,333	$ 18,543	$ 3,056	$ 265	$ 4,720
Amortizable intangible assets, Accumulated Amortization	(14,942)		(6,459)	(5,396)	(2,105)	(982)
Amortizable intangible assets, Gross Carrying Amount	$ 41,526		$ 25,002	$ 8,452	$ 2,370	$ 5,702
Amortizable intangible assets, Useful Life			10 years		5 years	15 years	2 years	4 years