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Intangible Assets, Net - Schedule of Activity in Intangible Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Intangible assets, net, beginning of period $ 44,633 $ 48,711
Purchases 1,075 356
Amortization (2,998) (3,160)
Intangible assets, net, end of period $ 42,710 $ 45,907