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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted, Options Outstanding 0 0  
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 1,275,415    
Options cancelled/forfeited/expired, Shares Available for Grant 10,000    
Restricted stock awards issued, Shares Available for Grant (336,091)    
Restricted stock awards forfeited, Shares Available for Grant 3,000    
Additional shares of stock issued, Shares Available for Grant (1,777)    
Shares Available for Grant, Ending Balance 950,547   1,275,415
Options Outstanding, Beginning Balance 196,329    
Options cancelled/forfeited/expired, Options Outstanding (10,000)    
Options exercised, Options Outstanding (56,746)    
Options Outstanding, Ending Balance 129,583   196,329
Exercisable as of December 31, 2020, Options Outstanding 129,583    
Aggregate Intrinsic Value $ 3,116   $ 2,636
Exercisable as of December 31 2020, Aggregate Intrinsic Value $ 3,116    
Weighted Average Exercise Price, Beginning Balance $ 12.12    
Weighted Average Exercise Price, Ending Balance 11.71   $ 12.12
Exercisable as of December 31 2020, Weighted Average Exercise Price $ 11.71    
Weighted Average Remaining Contractual Life 2 years 6 months   2 years 6 months
Exercisable as of December 31, 2020, Weighted Average Remaining Contractual Life 2 years 6 months