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Equity Compensation Plans - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | May 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  |  | $ 3,166,000 | $ 2,524,000 | $ 1,968,000 |
Share price |  |  | $ 14.08 | $ 9.18 |  |
PSU vesting percentage upon satisfaction of performance criteria |  |  | 50.00% |  |  |
PSU vesting percentage subject to continues service |  |  | 50.00% |  |  |
Restricted Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unearned compensation cost |  |  | $ 2,132,000 |  |  |
Weighted average recognition period |  |  | 2 years 3 months 18 days |  |  |
Estimated fair value of restricted common share awards vested |  |  | $ 1,836,000 | $ 1,539,000 | $ 1,319,000 |
Exercise price of outstanding SARs |  |  | $ 9.54 | $ 8.22 | $ 7.84 | $ 6.99
Shares issued |  |  | 213,744 | 233,706 | 168,010 |
Weighted average fair value, granted |  |  | $ 10.39 | $ 8.64 | $ 9.17 |
Restricted Stock | Subsequent Event |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares issued | 134,198 |  |  |  |  |
Weighted average fair value, granted | $ 14.35 |  |  |  |  |
Grant date fair value | $ 1,926,000 |  |  |  |  |
SARs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unearned compensation cost |  |  | $ 0 |  |  |
Intrinsic value exercisable |  |  | 43,000 |  |  |
Intrinsic value outstanding |  |  | $ 43,000 |  |  |
Exercise price of outstanding SARs |  |  | $ 9.35 | 9.35 | 9.28 | $ 9.15
Weighted average contractual life of outstanding SARs |  |  | 1 month 6 days |  |  |
Weighted average contractual life of exercisable SARs |  |  | 1 month 6 days |  |  |
Performance Share Units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock compensation expense |  |  | $ 2,649,000 |  |  |
Weighted average recognition period |  |  | 2 years 6 months |  |  |
Exercise price of outstanding SARs |  |  | $ 7.52 | $ 7.04 | $ 7.12 |
Number of shares granted based on target award performance period |  |  | 3 years |  |  |
Shares issued |  |  | 263,929 | 302,768 | 150,980 |
Number of shares granted based on target award percentage |  |  |  |  | 150.00% |
Weighted average fair value, granted |  |  | $ 8.35 | $ 7.00 | $ 7.12 |
Performance Share Units | Subsequent Event |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted based on target award performance period | 3 years |  |  |  |  |
Shares issued | 226,469 |  |  |  |  |
Minimum | Restricted Stock | Subsequent Event |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 2 years |  |  |  |  |
Minimum | Market Performance Condition |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of total shareholders return |  |  | 70.00% |  |  |
Minimum | Subjective Performance Condition |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of individual criteria |  |  | 20.00% |  |  |
Minimum | Performance Share Units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted based on target award percentage |  |  | 0.00% |  |  |
Maximum | Restricted Stock | Subsequent Event |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |
Maximum | Market Performance Condition |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of total shareholders return |  |  | 80.00% |  |  |
Maximum | Subjective Performance Condition |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of individual criteria |  |  | 30.00% |  |  |
Maximum | Performance Share Units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted based on target award percentage |  |  | 150.00% |  |  |
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 |  | 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 |  |  |  |

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