Intangible Assets, Net - Schedule of Activity in Intangible Assets, Net (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, net, beginning of period	$ 41,783	$ 44,633
Additions	2,400
Amortization	(1,674)	(2,051)
Intangible assets, net, end of period	$ 42,509	$ 42,582