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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share Reconciliation [Abstract]        
Income available to common stockholders $ 20,890 $ 33,368 $ 64,228 $ 99,372
Income available to common stockholders plus assumed exercises of stock options $ 20,890 $ 33,368 $ 64,228 $ 99,372
Income available to common stockholders - Shares 32,668,789 32,641,902 32,666,554 32,627,924
Dilutive effect of stock options - Shares 500,149 685,311 523,740 686,374
Income available to common stockholders plus assumed exercises of stock options - Shares 33,168,938 33,327,213 33,190,294 33,314,298
Income available to common stockholders - Per Share Amount $ 0.64 $ 1.02 $ 1.97 $ 3.04
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.63 $ 1.00 $ 1.94 $ 2.98