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Share-Based Compensation - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Deferral $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares granted under incentive plan | 73,515 |  |  |
Forfeiture of restricted stock based unit | 7,821 |  |  |
Deferred shares and held by the rabbi trust | 267,641 | 269,630 |  |
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 | $ | $ 500,000 | $ 500,000 | $ 400,000 |
Compensation cost expected to be recognized over period | $ | $ 500,000 |  |  |
Weighted-average period | 1 year 7 months 6 days |  |  |
Time-Based RSUs [Member] | Retired Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeiture of restricted stock based unit | 1,068 |  |  |
Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average period | 1 year 7 months 6 days |  |  |
Performance-based compensation expense (income) | $ | $ 3,900,000 | 3,700,000 | 2,700,000 |
Performance-Based RSUs [Member] | Grant 2018 and 2017 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeiture of restricted stock based unit | 6,753 |  |  |
Remaining compensation expense | $ | $ 3,900,000 |  |  |
Service and Performance-based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Excess tax benefits from restricted share awards | $ | $ 500,000 | $ 200,000 | $ 200,000 |
1999 Stock Option Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised, Number of Shares | 750 | 0 | 4,800 |
1999 Stock Option Plan [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total intrinsic value of stock options | $ | $ 100,000 |  |  |
Compensation expenses | $ | 0 | $ 0 | $ 0 |
1999 Stock Option Plan [Member] | Stock Options [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash received for the exercise of stock options | $ | $ 100,000 |  |  |
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] | 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 | 15,000 |  |  |
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 | 235,599 |  |  |
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] | 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 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] | 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 Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised, Number of Shares | 4,000 | 3,500 | 28,500 |
Total intrinsic value of stock options | $ | $ 100,000 | $ 100,000 | $ 700,000 |
Cash received for the exercise of stock options | $ | $ 200,000 | $ 200,000 | $ 1,500,000 |
Granted, Number of Shares | 5,000 | 5,000 | 5,000 |
Weighted-average period | 2 years 6 months |  |  |
Estimated Forfeitures | $ | $ 0 |  |  |
Weighted average grant date fair value options granted | $ / shares | $ 60.60 |  |  |
Expected compensation cost related to unvested awards not yet recognized | $ | $ 200,000 |  |  |
Long Term Incentive Plan Stock Option [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expenses | $ | 1,000,000 | $ 1,000,000 | $ 1,000,000 |
Excess tax benefits | $ | $ 100,000 | $ 100,000 | $ 100,000 |

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