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Earnings Per Common Share - Computation of Basic and Diluted EPS (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 $ 72,951 $ 60,367
Basic weighted average common shares outstanding 90,708 99,425
Effect of dilutive securities:    
Stock options and restricted stock units 916 573
Diluted weighted average common shares outstanding 91,624 99,998
Earnings per basic common share $ 0.80 $ 0.61
Earnings per diluted common share $ 0.80 $ 0.60