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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, 2019
Dec. 31, 2018
Sep. 30, 2019
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 715,590    
Restricted stock awards issued, Shares Available for Grant (417,021)    
Restricted stock awards forfeited, Shares Available for Grant 2,450    
Additional shares of stock issued, Shares Available for Grant (2,946)    
Shares Available for Grant, Ending Balance 298,073   715,590
Options Outstanding, Beginning Balance 484,031    
Options exercised, Options Outstanding (28,667)    
Options Outstanding, Ending Balance 455,364   484,031
Exercisable as of December 31, 2019, Options Outstanding 449,697    
Aggregate Intrinsic Value $ 1,932   $ 1,569
Excercisable as of December 31, 2019, Aggregate Intrinsic Value $ 1,928    
Weighted Average Exercise Price, Beginning Balance $ 12.42    
Options exercised, Weighted Average Exercise Price 11.42    
Weighted Average Exercise Price, Ending Balance 12.49   $ 12.42
Excercisable as of December 31, 2019, Weighted Average Exercise Price $ 12.43    
Weighted Average Remaining Contractual Life 3 years 6 months   3 years 8 months 12 days
Excercisable as of December 31, 2019, Weighted Average Remaining Contractual Life 3 years 6 months