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Share-Based Compensation - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Deferral $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares granted under incentive plan | 81,086 |  |  |
Forfeiture of restricted stock based unit | 13,814 |  |  |
Deferred shares and held by the rabbi trust | 265,508 | 267,641 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | 800,000 |  |  |
Long Term Incentive Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | 100,000 |  |  |
Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expenses | $ | $ 400,000 | $ 500,000 | $ 500,000 |
Compensation cost expected to be recognized over period | $ | $ 5,000,000 |  |  |
Weighted-average period | 1 year 8 months 12 days |  |  |
Time-Based RSUs [Member] | Former Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeiture of restricted stock based unit | 2,763 |  |  |
Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average period | 1 year 8 months 12 days |  |  |
Performance-based compensation expense (income) | $ | $ 3,500,000 | 3,900,000 | 3,700,000 |
Remaining compensation expense | $ | $ 3,600,000 |  |  |
Performance-Based RSUs [Member] | Former Officer [Member] | Grant 2020, 2019 and 2018 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeiture of restricted stock based unit | 11,051 |  |  |
Service and Performance-based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Excess tax benefits from restricted share awards | $ | $ 400,000 | $ 500,000 | $ 200,000 |
Long Term Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | 900,000 |  |  |
2016 Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards |  |  |  | 1,000,000
Incentive plan expiry date | May 10, 2026 |  |  |
2016 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards |  |  |  | 900,000
Restricted shares granted under incentive plan | 316,685 |  |  |
2016 Incentive Plan [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards |  |  |  | 100,000
Granted, Number of Shares | 40,500 |  |  |
Deferred Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of deferrals | Deferral | 2 |  |  |
Long Term Incentive Plan and 2016 Incentive Plan [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Option issued under plan vest and expire | 5 years |  |  |
Long Term Incentive Plan and 2016 Incentive Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Option issued under plan vest and expire | 10 years |  |  |
Long Term Incentive Plan and 2016 Incentive Plan [Member] | After One Year [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option awards vesting percentage | 50.00% |  |  |
Long Term Incentive Plan and 2016 Incentive Plan [Member] | After Two Years [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option awards vesting percentage | 75.00% |  |  |
Long Term Incentive Plan and 2016 Incentive Plan [Member] | After Three Years [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option awards vesting percentage | 100.00% |  |  |
Long Term Incentive Plan Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted, Number of Shares | 25,500 | 5,000 | 5,000 |
Compensation expenses | $ | $ 100,000 |  |  |
Weighted-average period | 2 years 2 months 12 days |  |  |
Estimated Forfeitures | $ | $ 0 |  |  |
Weighted average grant date fair value options granted | $ / shares | $ 48.13 |  |  |
Exercised, Number of Shares | 5,050 | 4,000 | 3,500 |
Total intrinsic value of stock options | $ |  | $ 100,000 | $ 100,000 |
Cash received for the exercise of stock options | $ | $ 200,000 | 200,000 |  |
Expected compensation cost related to unvested awards not yet recognized | $ | 300,000 |  |  |
Long Term Incentive Plan Stock Option [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expenses | $ |  | 100,000 | 100,000 |
Total intrinsic value of stock options | $ | 100,000 |  |  |
Excess tax benefits | $ | $ 100,000 | $ 100,000 | $ 100,000 |

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