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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income available to common stockholders $ 63,969 $ 72,264 $ 170,529 $ 113,171
Denominator:        
Basic weighted-average shares outstanding (shares) 147,725,074 151,214,744 150,377,472 155,238,206
Effect of dilutive shares:        
Stock options and unvested restricted stock units (shares) 592,958 915,081 1,104,984 697,870
Diluted weighted-average shares outstanding (shares) 148,318,032 152,129,825 151,482,456 155,936,076
Earnings per share        
Basic (in dollars per share) $ 0.43 $ 0.48 $ 1.13 $ 0.73
Diluted (in dollars per share) $ 0.43 $ 0.48 $ 1.13 $ 0.73
Antidilutive stock options and unvested restricted stock units not included in diluted earnings per share (in shares) 2,008,612 3,406,498 1,280,500 3,710,674