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Share-Based Compensation - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) Deferral $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | May 10, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares granted under incentive plan | shares |  | 90,807 |  |  |
Forfeiture of restricted stock based unit | shares |  | 12,304 |  |  |
Deferred shares and held by the rabbi trust | shares |  | 289,026 | 297,281 |  |
Long Term Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  | 900,000 |  |  |
2016 Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  |  |  |  | 1,000,000
Incentive plan expiry date |  | May 10, 2026 |  |  |
Deferred Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of deferrals | Deferral |  | 2 |  |  |
Long Term Incentive Plan Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercised, Number of Shares | shares |  | 28,500 | 500 | 0 |
Total intrinsic value of stock options |  | $ 7,000,000 | $ 0 |  |
Cash received for the exercise of stock options |  | 1,500,000 |  |  |
Compensation expenses |  | $ 100,000 | $ 200,000 | $ 300,000 |
Granted, Number of Shares | shares |  | 5,000 | 0 | 10,500 |
Weighted-average period |  | 1 year 10 months 24 days |  |  |
Estimated Forfeitures |  | $ 0 |  |  |
Weighted average grant date fair value options granted | $ / shares |  | $ 48.00 |  |  |
Expected compensation cost related to unvested awards not yet recognized |  | $ 100,000 |  |  |
Long Term Incentive Plan Stock Option [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 Stock Option [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 Stock Option [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] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash received for the exercise of stock options |  |  | $ 100,000 |  |
Excess tax benefits |  | $ 100,000 | $ 100,000 | $ 100,000 |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercised, Number of Shares | shares |  | 4,800 | 6,450 | 0 |
Total intrinsic value of stock options |  | $ 100,000 | $ 100,000 | $ 100,000 |
Cash received for the exercise of stock options |  | 2,000,000 | 2,000,000 |  |
Compensation expenses |  | $ 0 | 0 | 0 |
Stock Options [Member] | 2016 Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  |  |  |  | 100,000
Granted, Number of Shares | shares |  | 5,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  | 800,000 |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer And Other Officers [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expenses | $ 600,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2016 Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  |  |  |  | 900,000
Restricted shares granted under incentive plan | shares |  | 90,807 |  |  |
Long Term Incentive Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares reserved for awards | shares |  | 100,000 |  |  |
Long Term Incentive Stock Option [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 Stock Option [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option issued under plan vest and expire |  | 5 years |  |  |
Time-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expenses |  | $ 400,000 | 300,000 | 300,000 |
Compensation cost expected to be recognized over period |  | $ 400,000 |  |  |
Weighted-average period |  | 1 year 9 months 18 days |  |  |
Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average period |  | 1 year 9 months 18 days |  |  |
Performance-based compensation expense (income) |  | $ 2,700,000 | $ 900,000 | $ 1,000,000 |
Performance-Based RSUs [Member] | Grant 2014 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Forfeiture of restricted stock based unit | shares |  |  | 40,676 |  |
Remaining performance-based compensation expense |  | 3,700,000 |  |  |
Performance-Based RSUs [Member] | Grant 2013 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Forfeiture of restricted stock based unit | shares |  |  |  | 47,832 |
Service and Performance-based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess tax benefits from restricted share awards |  | $ 200,000 |  |  |
Service and Performance-based RSUs [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Excess tax benefits from restricted share awards |  |  | $ 100,000 | $ 100,000 |

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