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Share-Based Payments - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation, non-vested restricted stock awards $ 3.9
Unrecognized compensation, non-vested restricted stock awards expected recognized period 2 years 8 months 2 days
Restricted Stock | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 1 year
Restricted Stock | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 5 years
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation, non-vested restricted stock awards $ 2.5
Unrecognized compensation, non-vested restricted stock awards expected recognized period 2 years 3 months 15 days