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Stock Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Phantom Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Phantom Share Units (PSUs) | Non Employee Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted 6,370    
Amount accrued $ 15,000 $ 15,000  
2019 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted to any single participant in any calendar year   100,000  
Shares available for issuance under the plan 2,455,000 2,455,000  
2019 Omnibus Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-based award paid to a single participant in any calendar year   $ 5,000,000  
Aggregate number of common stock for issuance under the plan 2,500,000 2,500,000  
Period of years for which the 2,500,000 shares can be granted over   5 years  
2019 Omnibus Incentive Plan | Employee Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term Period   10 years  
2019 Omnibus Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Now-cancelled A&R 2014 Plan | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Cash awards   $ 3,019,000  
Deferred compensation payment $ 708,000 $ 708,000 $ 526,000
Deferred compensation, percentage   61.00% 76.00%
Now-cancelled A&R 2014 Plan | Executive Officer | Beginning January 1, 2015 through December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   200.00%  
Now-cancelled A&R 2014 Plan | Minimum | Executive Officer | Beginning January 1, 2015 through December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage   0.00%  
Now-cancelled A&R 2014 Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense, net 3,428,000 $ 3,428,000  
Unrecognized compensation expense, net, weighted average period   1 year 10 months 24 days  
Total fair value of restricted stock vested   $ 1,011,000  
Restricted stock awards granted, holding period   2 years  
Share based payment awards discounted for restriction of liquidity percentage   20.60%  
Now-cancelled A&R 2014 Plan | Phantom Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Units granted   319,892  
Units vested   115,020  
Units forfeited   27,862  
Total fair value of units outstanding $ 425,000 $ 425,000