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Equity Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | May 31, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 4,300,000 | 300,000,000 | 300,000,000 |
Expiration date of Incentive Plan |  |  | May 12, 2026 |  |
Stock compensation expense |  |  | $ 5,635 | $ 3,166 | $ 2,524
PSU vesting percentage upon satisfaction of performance criteria |  |  | 50.00% |  |
PSU vesting percentage subject to continues service |  |  | 50.00% |  |
Restricted Stock and RSUs |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issued |  |  | 282,735 | 213,744 | 233,706
Weighted average fair value, granted |  |  | $ 12.85 | $ 10.39 | $ 8.64
Unearned compensation cost |  |  | $ 2,437 |  |
Weighted average recognition period |  |  | 1 year 9 months 18 days |  |
Estimated fair value of restricted common share awards vested |  |  | $ 2,076 | $ 1,836 | $ 1,539
Restricted Stock and RSUs | Subsequent Event |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issued | 86,591 |  |  |  |
Weighted average fair value, granted | $ 14.17 |  |  |  |
Grant date fair value | $ 1,227 |  |  |  |
Market Performance Condition |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of total shareholders return |  |  | 70.00% |  |
Subjective Performance Condition |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of individual criteria |  |  | 30.00% |  |
Performance Share Units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense |  |  | $ 2,131 |  |
Shares issued |  |  | 202,145 | 263,929 | 302,768
Weighted average fair value, granted |  |  | $ 11.77 | $ 8.35 | $ 7.00
Weighted average recognition period |  |  | 2 years 3 months 18 days |  |
Estimated fair value |  |  | $ 1,862 | $ 0 | $ 0
Minimum | Restricted Stock and RSUs | Subsequent Event |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period | 2 years |  |  |  |
Maximum | Restricted Stock and RSUs | Subsequent Event |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period | 3 years |  |  |  |
Long Term Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards performance period |  |  | 3 years |  |
Long Term Incentive Plan | Minimum | Restricted Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 2 years |  |  |
Long Term Incentive Plan | Minimum | RSUs |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 3 years |  |  |
Long Term Incentive Plan | Maximum | Restricted Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 4 years |  |  |
Long Term Incentive Plan | Maximum | RSUs |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Awards vesting period |  | 4 years |  |  |
Employee |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense |  |  | $ 1,667 |  |

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