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Stock Options and Other Equity-Based Incentive Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding options under the plan (in shares) 160,500 343,000 446,400
Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Number of units outstanding expected to vest 51,312 45,536  
Weighted-average remaining contractual term 1 year 3 months 18 days    
Pre-tax compensation costs $ 903,445    
Number of units released 22,237    
Restricted Stock Units (RSUs) | Service Condition Vesting RSUs      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Number of units outstanding expected to vest 68,597 66,947  
Weighted-average remaining contractual term 1 year 7 months 6 days    
Pre-tax compensation costs $ 1,837,304    
Number of units released 33,060    
Minimum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Number of units released 0    
Maximum | Restricted Stock Units (RSUs) | Market Plus Service Condition Vesting RSUs      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Number of units released 76,968    
2009 Plan      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding options under the plan (in shares) 160,500    
Options available for grant under the plan 1,315,537    
2009 Plan | Restricted Stock Units (RSUs)      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Number of units outstanding expected to vest 60,747    
RSUs outstanding 59,162    
2001 Plan      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options available for grant under the plan 0