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Earnings Per Share - Calculations of Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share And Equity [Abstract]                              
Net income $ 11,375 $ 3,419 $ 1,885 $ 10,785 $ 12,243 $ 3,007 $ 13,249 $ 19,081 $ 19,394 $ (11,135) $ 2,372 $ 22,624 $ 27,464 $ 47,580 $ 33,255
Basic weighted average common shares outstanding                         35,237 34,764 24,826
Add: Incremental shares for:                              
Dilutive effect of warrants                             116
Dilutive effect of restricted stock                         71 300 315
Diluted weighted average common shares outstanding                         35,308 35,064 25,257
Net income per common share                              
Basic $ 0.32 $ 0.10 $ 0.05 $ 0.31 $ 0.35 $ 0.09 $ 0.38 $ 0.55 $ 0.66 $ (0.48) $ 0.10 $ 0.97 $ 0.78 $ 1.37 $ 1.34
Diluted $ 0.32 $ 0.10 $ 0.05 $ 0.31 $ 0.35 $ 0.09 $ 0.38 $ 0.54 $ 0.65 $ (0.48) $ 0.10 $ 0.96 $ 0.78 $ 1.36 $ 1.32