Net Income Per Share - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 35,992	$ 26,977
Basic Earnings Per Share, Weighted average common shares outstanding	134,912	113,998
Basic Net Income Per Share	$ 0.27	$ 0.24
Net income	$ 35,992	$ 26,977
Diluted Earnings Per Share, Weighted average common shares outstanding	134,912	113,998
Effect of dilutive securities: Restricted stock	445	526
Effect of dilutive securities: Stock options	74	39
Diluted Earnings Per Share, Weighted average shares outstanding	135,431	114,563
Diluted Net Income Per Share	$ 0.27	$ 0.24