Income Taxes - Schedule of Net Operating Losses for Tax Purposes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Beginning NOLs	$ (109,839)	$ (140,959)	$ (136,515)
2014 return to provision adjustment	3,906
U.S. GAAP income	143,665	77,609	51,537
Tax differences:
Temporary	11,804	(1,425)	5,580
Permanent	(73,175)	(45,064)	(61,561)
State taxes	(2,431)	(94)
Ending NOLs	$ (26,070)	$ (109,839)	$ (140,959)