Earnings Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income	$ 9,863	$ 24,530
Weighted average common shares outstanding:
Total weighted average basic shares	33,142	33,000
Shares applicable to stock-based compensation	45	8
Total weighted average diluted shares	33,187	33,008
Net income – basic	$ 0.30	$ 0.74
Net income – diluted	$ 0.30	$ 0.74