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Share-Based Compensation - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Deferral shares | Jun. 30, 2018 USD ($) shares | Dec. 31, 2018 shares | May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred shares and held by the rabbi trust | 270,860 |  | 270,860 |  | 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 |  | 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 |  | 100,000 |  |  |
Time-Based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expenses | $ | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 |  |
Compensation cost expected to be recognized over period | $ | 700,000 |  | $ 700,000 |  |  |
Weighted-average period |  |  | 1 year 10 months 24 days |  |  |
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) | $ | 900,000 | 700,000 | $ 1,700,000 | $ 1,400,000 |  |
Remaining compensation expense | $ | $ 4,400,000 |  | $ 4,400,000 |  |  |
1999 Stock Option Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercised, Number of Shares |  |  | 0 | 0 |  |
Granted, Number of Shares |  |  | 0 |  |  |
1999 Stock Option Plan [Member] | Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expenses | $ |  |  | $ 0 | $ 0 |  |
Long Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for awards | 900,000 |  | 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
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
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] |  |  |  |  |  |
Exercised, Number of Shares |  |  | 0 | 1,500 |  |
Weighted-average period |  |  | 2 years 1 month 6 days |  |  |
Granted, Number of Shares |  |  | 0 | 0 |  |
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 | $ 100,000 | $ 100,000 |  |
Expected compensation cost related to unvested awards not yet recognized | $ | $ 100,000 |  | $ 100,000 |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of deferrals | Deferral |  |  | 2 |  |  |

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