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Incentive Compensation Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Feb. 20, 2020 | Feb. 21, 2019 | Nov. 26, 2018 | May 29, 2018 | Mar. 26, 2018 | Feb. 28, 2018 | Feb. 26, 2018 | Mar. 24, 2017 | Feb. 23, 2017 | Dec. 19, 2016 | Sep. 30, 2016 | Sep. 19, 2016 | Jun. 07, 2016 | Mar. 01, 2016 | Mar. 01, 2016 | Feb. 18, 2016 | Dec. 30, 2015 | Jun. 26, 2015 | Feb. 05, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.72 | $ 14.22 | $ 14.50
Maximum number of shares that are available to be awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Vesting period of restricted stock | 0 years | 0 years |  |  |  | 0 years |  |  | 0 years |  |  |  |  |  |  | 0 years | 0 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,689,027 |  |
Performance Based Stock Awards Vesting Period | 3 years | 3 years |  |  |  | 3 years |  |  | 3 years |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Award Participants Earn | 40.00% | 40.00% |  |  |  | 40.00% |  |  | 40.00% |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Performance Shares Awards As Percentage Of Target | 100.00% | 100.00% |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Percentage Of Target Award Opportunities Maximum In Certain Cases | 200.00% | 200.00% |  |  |  | 200.00% |  |  | 200.00% |  |  |  |  |  |  | 200.00% |  |  |  |  |  |
Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 95,300 | 63,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 13.72 | $ 14.22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date | Feb. 20, 2023 | Feb. 22, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 15,000 | 2,000 | 3,000 | 2,000 |  | 77,500 |  |  | 15,000 | 10,000 | 33,000 | 10,000 | 5,000 | 10,000 |  |  | 1,000 |  |  |  |
Grant Price (in dollars per share) |  | $ 14.22 | $ 13.82 | $ 15.44 | $ 14.08 |  | $ 14.49 |  |  | $ 13.96 | $ 10.09 | $ 10.02 | $ 9.34 | $ 8.84 | $ 8.84 |  | $ 9.18 | $ 9.84 |  |  |  |
Vesting Date |  | Feb. 22, 2022 | Nov. 26, 2021 | May 29, 2021 | Mar. 26, 2021 |  | Feb. 26, 2021 |  |  | Dec. 19, 2019 | Sep. 30, 2019 | Sep. 19, 2019 | Jun. 07, 2019 | Mar. 01, 2019 | Mar. 01, 2019 |  |  | Jun. 26, 2018 |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.9 | $ 2.7 | $ 2.6
Unrecognized compensation cost related to unvested restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2 |  |
Vesting period of restricted stock |  | 1 year | 1 year | 1 year | 1 year |  | 1 year |  |  | 3 years | 1 year | 3 years | 1 year | 1 year | 1 year |  |  | 1 year |  |  |  |
Restricted Stock [Member] | Long Term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.55 |  |  |
Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 05, 2018 |  |  |
Vesting period of restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Time [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 13.72 | $ 14.22 |  |  |  | $ 14.17 |  |  | $ 13.29 |  |  |  |  |  |  |  |  |  |  |  |  |
Component 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | 12.43 | 13.07 |  |  |  | 13.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Component 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) | $ 15.37 | $ 16.62 |  |  |  | $ 15.83 |  |  | $ 15.09 |  |  |  |  |  |  |  |  |  |  |  |  |
March 24, 2017 Grant 3 [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date |  |  |  |  |  |  |  | Mar. 24, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 24, 2017 Grant 1 [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  | $ 12.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Date |  |  |  |  |  |  |  | Mar. 24, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |

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