Income Taxes - Summary of Changes in Deferred Tax Assets Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning Balance	$ 1,044,152	$ 1,225,305	$ 1,238,765
Credited to provision (benefit) for income taxes	(954,487)	(203,051)	(35,470)
Charged (credited) to other comprehensive income	(414)	21,898	22,010
Ending Balance	$ 89,251	$ 1,044,152	$ 1,225,305