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Basic and Diluted Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income available to common stockholders $ 40,099 $ 38,989
Weighted average number of common shares-basic (shares) 45,239,988 41,730,610
Effect of dilutive securities:    
Employee stock-based compensation awards and warrants (shares) 2,339,321 3,842,606
Weighted average number of common shares-diluted (shares) 47,579,309 45,573,216
Basic earnings (loss) per share (usd per share) $ 0.89 $ 0.93
Diluted earnings (loss) per share (usd per share) $ 0.84 $ 0.86
Weighted average number of anti-dilutive equity awards (shares) 28,813 13,139