Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, net	$ 32,227		$ 32,227		$ 36,302
Amortization expense	1,300	$ 1,400	4,100	$ 2,500
Goodwill	$ 72,683		$ 72,683		$ 72,592