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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
Earnings Per Share [Abstract]                      
Net income $ 40,567 $ 27,143 $ 14,311 $ 14,931 $ 25,951 $ 31,399 $ 24,393 $ 30,890 $ 96,951 $ 112,633 $ 118,387
Basic weighted average common shares outstanding (in shares)                 69,548,499 64,604,224 64,942,886
Dilutive shares (in shares)                 77,459 130,367 160,211
Diluted weighted average common shares outstanding (in shares)                 69,625,958 64,734,591 65,103,097
Earnings per share:                      
Basic (in dollars per share) $ 0.53 $ 0.37 $ 0.22 $ 0.23 $ 0.40 $ 0.49 $ 0.38 $ 0.48 $ 1.39 $ 1.74 $ 1.82
Diluted (in dollars per share) $ 0.53 $ 0.37 $ 0.22 $ 0.23 $ 0.40 $ 0.49 $ 0.38 $ 0.48 $ 1.39 $ 1.74 $ 1.82
Anti-dilutive stock options and awards excluded from computation of earnings per share (in shares)                 999,718 646,457 443,748