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Stock-Based Compensation (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 51,000   $ 479,000 $ 1,207,000 $ 1,520,000
Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares originally reserved (in shares) 4,400,676     4,400,676  
Number of shares available for grant (in shares) 1,661,941     1,661,941  
Incentive Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       10 years  
Award service period (in years)       4 years  
Unrecognized compensation costs $ 0     $ 0  
Incentive Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount in excess of scheduled compensation expense   $ 798,000      
Unrecognized compensation cost $ 53,000     $ 53,000  
Unrecognized compensation cost, period of recognition (in years)       11 months 12 days  
Incentive Plan | Restricted Stock Units (RSUs) | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       2 years  
Incentive Plan | Restricted Stock Units (RSUs) | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       4 years  
Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of stock vested       $ 890,000  
Incentive Plan | Second Anniversary of Award Date | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of options vesting 50.00%     50.00%  
Incentive Plan | Third Anniversary of Award Date | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of options vesting 25.00%     25.00%  
Incentive Plan | Fourth Anniversary of Award Date | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of options vesting 25.00%     25.00%  
Deferred Plan | Deferred Compensation          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 0 $ 0