Income Tax - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Operating expenses not currently deductible	$ 9,953	$ 9,093
Stock option and other employee benefit plans	13,504	9,815
Capital loss and credit carryforward	179	177
Property and equipment		46
Total deferred income tax assets	23,636	19,131
Intangible assets	(111,653)	(13,424)
Property and equipment	(2,781)
Other	(228)	(203)
Total deferred income tax liabilities	(114,662)	(13,627)
Net deferred income tax (liability)	$ (91,026)
Net deferred income tax asset		$ 5,504