Income Taxes - Balance Sheet Presentation of the Company's Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current deferred tax assets	$ 0	$ 5,046
Current deferred tax liabilities	0	(355)
Net current deferred tax assets	0	4,691
Non-current deferred tax assets	107,618	102,168
Non-current deferred tax liabilities	(458)	(321)
Net non-current deferred tax assets before valuation allowance	107,160	101,847
Valuation allowance against non-current deferred tax assets	(860)	0
Net non-current deferred tax assets	106,300	101,847
Net deferred tax assets	$ 106,300	$ 106,538