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Share-Based Compensation - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Deferrals $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Forfeiture of restricted stock based unit | shares |  | 47,832 |  |
Deferred shares and held by the rabbi trust | shares |  | 296,635 | 292,609 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised, Number of Shares | shares |  | 0 | 1,000 | 19,150
Total intrinsic value of stock options |  | $ 0 |  | $ 600,000
Cash received for the exercise of stock options awards |  | 0 |  |
Compensation expenses |  | 0 | $ 0 | 0
Excess tax benefits |  | $ 0 | 0 | 200,000
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | shares |  | 800,000 |  |
Shares remaining to be issued | shares |  | 312,398 |  |
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 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | shares |  | 800,000 |  |
Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expenses |  | $ 300,000 | 300,000 | 300,000
Compensation cost expected to be recognized over period |  | $ 300,000 |  |
Weighted-average period |  | 1 year 7 months 6 days |  |
Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost expected to be recognized over period |  | $ 500,000 |  |
Weighted-average period |  | 2 years |  |
Performance-based compensation expense (income) |  | $ 1,000,000 | $ 1,000,000 | 2,700,000
Forfeiture of restricted stock based unit | shares |  | 47,832 | 3,537 |
Service and Performance-based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Excess tax benefits from restricted share awards |  |  | $ 100,000 | $ 100,000
Maximum [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total intrinsic value of stock options |  |  | 100,000 |
Cash received for the exercise of stock options awards |  |  | 100,000 |
Maximum [Member] | Service and Performance-based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Excess tax benefits from restricted share awards |  | $ 100,000 |  |
Grant 2012 [Member] | Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance-based compensation expense (income) |  |  | 200,000 |
Grant 2013 [Member] | Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance-based compensation expense (income) |  | 800,000 | $ 1,300,000 |
Grant 2014 [Member] | Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance-based compensation expense (income) |  | $ 800,000 |  |
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 |  |
Shares remaining to be issued | shares |  | 11,000 |  |
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 |  |
Long Term Incentive Plan Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised, Number of Shares | shares |  | 0 | 1,250 | 14,250
Cash received for the exercise of stock options awards |  | $ 0 | $ 100,000 |
Compensation expenses |  | 300,000 | 300,000 | $ 100,000
Excess tax benefits |  | $ 0 | $ 100,000 | $ 100,000
Weighted-average period |  | 2 years |  |
Option issued under plan vest |  | 50.00% |  |
Option issued under plan vest and granted after 2 years |  | 75.00% |  |
Option issued under plan vest and granted after 3 years |  | 100.00% |  |
Estimated Forfeitures |  | $ 0 |  |
Granted, Number of Shares | shares |  | 10,500 | 35,500 | 0
Weighted average grant date fair value options granted | $ / shares |  | $ 13.16 | $ 20.83 |
Expected compensation cost related to unvested awards not yet recognized |  | $ 400,000 |  |
Long Term Incentive Plan Stock Option [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total intrinsic value of stock options |  | $ 0 | $ 100,000 |
Long Term Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares reserved for awards | shares |  | 900,000 |  |
LTIP expiry date |  | Apr. 17, 2018 |  |
Deferred Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of deferrals | Deferrals |  | 2 |  |

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