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, 2014	Dec. 31, 2013	Sep. 30, 2014 Customer Relationships [Member]	Sep. 30, 2014 Acquired Technology [Member]	Sep. 30, 2014 Non-compete Agreements [Member]	Sep. 30, 2014 Trademarks [Member]	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Minimum [Member] Acquired Technology [Member]	Sep. 30, 2014 Maximum [Member]	Sep. 30, 2014 Maximum [Member] Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Total amortizable intangible assets	$ 21,201	$ 25,368	$ 16,043	$ 1,180	$ 155	$ 3,823
Amortizable intangible assets, Accumulated Amortization	(20,377)		(8,959)	(7,272)	(2,215)	(1,931)
Amortizable intangible assets, Gross Carrying Amount	$ 41,578		$ 25,002	$ 8,452	$ 2,370	$ 5,754
Amortizable intangible assets, Useful Life			10 years		5 years	3 years	2 years	2 years	10 years	4 years