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Stock Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 | $ 0 |  |
Shares, granted (in shares) | 0 | 0 |  |
Compensation expense restricted stock awards | $ 592,000 | $ 677,000 |  |
Vested, shares (in shares) | 25,940 |  |  |
Weighted average grant (in dollars per share) | $ 25.27 |  |  |
Fair value of shares vesting during period | $ 1,227,000 | $ 1,462,000 |  |
Performance Based Restricted Stock Awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares, granted (in shares) | 16,681 |  | 15,657 | 7,109
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 1,185,000 |  |  |
Restricted Stock Units (RSUs) | Vested Immediately |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense restricted stock awards | $ 350,000 |  |  |
Key Employees |  |  |  |
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% |  |  |
Key Employees | Vesting in year one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 25.00% |  |  |
Key Employees | Vesting in year two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 25.00% |  |  |
Key Employees | Vesting in year three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 25.00% |  |  |
Key Employees | Vesting in year four |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 25.00% |  |  |
Independent Directors |  |  |  |
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% |  |  |
Award vesting period | 3 years |  |  |
Independent Directors | Vesting in year one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 33.33% |  |  |
Independent Directors | Vesting in year two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 33.33% |  |  |
Independent Directors | Vesting in year three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive plan, vesting per year | 33.33% |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vested, shares (in shares) | 13,850 |  |  |
Weighted average grant (in dollars per share) | $ 25.27 |  |  |

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