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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income $ 43,301 $ 42,710 $ 47,218 $ 42,402 $ 35,497 $ 41,976 $ 35,710 $ 31,555 $ 175,631 $ 144,738 $ 134,572
Denominator:                      
Basic weighted average shares outstanding 115,791,757 115,773,030 115,733,934 116,259,058 116,591,434 116,800,120 116,972,384 117,086,956 115,888,859 116,861,194 117,479,340
Effect of dilutive securities:                      
Diluted weighted average shares outstanding 116,169,754 116,134,623 116,061,988 116,647,442 117,025,466 117,209,206 117,375,080 117,658,354 116,252,866 117,315,498 118,134,604
Basic earnings per share $ 0.37 $ 0.37 $ 0.41 $ 0.37 $ 0.31 $ 0.36 $ 0.31 $ 0.27 $ 1.52 $ 1.24 $ 1.15
Diluted earnings per share $ 0.37 $ 0.37 $ 0.41 $ 0.37 $ 0.31 $ 0.36 $ 0.31 $ 0.27 $ 1.51 $ 1.24 $ 1.14
Stock appreciation rights [Member]                      
Effect of dilutive securities:                      
Dilutive securities                 192,579 248,850 353,400
Restricted stock [Member]                      
Effect of dilutive securities:                      
Dilutive securities                 171,428 205,454 301,864