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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, 2018
Dec. 31, 2017
Sep. 30, 2018
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 1,047,247    
Options cancelled/forfeited/expired, Shares Available for Grant 4,667    
Restricted stock awards issued, Shares Available for Grant (319,624)    
Restricted stock awards forfeited, Shares Available for Grant 2,700    
Additional shares of stock issued, Shares Available for Grant (2,135)    
Shares Available for Grant, Ending Balance 732,855   1,047,247
Options Outstanding, Beginning Balance 611,223    
Options cancelled/forfeited/expired, Options Outstanding (4,667)    
Options exercised, Options Outstanding (108,275)    
Options Outstanding, Ending Balance 498,281   611,223
Exercisable as of December 31, 2017, Options Outstanding 494,947    
Aggregate Intrinsic Value $ 2,986   $ 5,544
Exercisable as of December 31, 2017, Aggregate Intrinsic Value $ 2,986    
Weighted Average Exercise Price, Beginning Balance $ 12.18    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 5.42    
Options exercised, Weighted Average Exercise Price 12.11    
Weighted Average Exercise Price, Ending Balance 12.26   $ 12.18
Exercisable as of December 31, 2017, Weighted Average Exercise Price $ 12.21    
Weighted Average Remaining Contractual Life 4 years 4 months 24 days   4 years 4 months 24 days
Exercisable as of December 31, 2018, Weighted Average Remaining Contractual Life 4 years 3 months 18 days