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Stock Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of nonqualified options or restricted stock for key employees and independent director | 500,000 |  |
Description of award terms | For key employees, the plan vesting is either one-third or one-fourth of the granted options or restricted stock per year, beginning one year after the grant date, with 100% vesting on the third or fourth anniversary of the grant date, respectively. Prior to 2018, for independent directors, the vesting schedule is one-third of the granted options or restricted stock per year beginning one year after the grant date, with 100% vested on the third anniversary of the grant date. |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 |  |
Shares, granted | 0 | 0 |
Compensation expense restricted stock awards | $ 674,000 | $ 189,000 |
Vested, Shares | 40,105 |  |
Fair value of shares vesting during period | $ 1,462,000 | $ 917,000 |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost related to nonvested restricted stock | 1,584,000 |  |
Restricted Stock Units (RSUs) [Member] | Vested Immediately [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense restricted stock awards | $ 385,000 |  |
Vested, Shares | 15,600 |  |
Performance Based Restricted Stock Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares, granted | 15,702 |  | 10,000
Independent Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Starting period of vesting of stock based award | 1 year |  |
Aggregate percentage of stock based awards to be matured | 100.00% |  |
Stock incentive plan, vesting per year | 33.33% |  |
Award vesting period | 3 years |  |
Key Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Starting period of vesting of stock based award | 1 year |  |
Aggregate percentage of stock based awards to be matured | 100.00% |  |
Stock incentive plan, vesting per year | 25.00% |  |
Award vesting period | 4 years |  |

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