Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 4,474	$ 7,844	$ 146	$ 17,821
(Loss) income before income taxes	$ 9,570	$ 20,777	$ (183,352)	$ 47,284
Effective income tax percent	46.80%	37.80%	(0.10%)	37.70%
Incremental tax expense	$ 500		$ 800
United States statutory income tax rate, percent			35.00%