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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:            
Net income available to common shareholders $ 47,218 $ 42,402 $ 35,710 $ 31,555 $ 89,620 $ 67,265
Denominator:            
Basic weighted average shares outstanding 57,866,967   58,486,192   57,998,247 58,514,676
Effect of dilutive securities:            
Diluted weighted average shares outstanding 58,030,994   58,687,540   58,177,357 58,758,201
Basic earnings per share $ 0.82   $ 0.61   $ 1.55 $ 1.15
Diluted earnings per share $ 0.81   $ 0.61   $ 1.54 $ 1.14
Stock appreciation rights and options [Member]            
Effect of dilutive securities:            
Dilutive securities 89,871   129,839   90,297 141,958
Restricted stock [Member]            
Effect of dilutive securities:            
Dilutive securities 74,156   71,509   88,813 101,567