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Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payments award, number of shares available for grant | 8,300,000 |  |
Equity-based compensation plan expense | $ 7.4 | $ 6.4 | $ 6.8
Contractual term of stock options, Maximum | 10 years |  |
Vesting Period | 3 years |  |
Portion of increments granted for stock options | One-third |  |
Term of increment grant | One year after the date of grant |  |
Expected volatility of the stock | The expected volatility of the stock was derived by using a 50/50 blend of implied and historical changes in the Company's historical stock prices over a time frame consistent with the expected life of the award. |  |
Expected vesting percentage | 20.00% |  |
Percentage of compensation subject to statutory limits | 50.00% |  |
Percentage of participant's contribution | 50.00% |  |
Percentage of participant's base salary plus annual cash bonus | 3.00% |  |
Percentage of vested contributions | 20% per year |  |
Contribution by the company | 1.1 | 1.0 | 1.1
Non-qualified elective deferred compensation plan | 100% of their base salaries and annual performance-based cash bonuses, less applicable taxes and benefits deductions |  |
Matching contribution to participant | The Company provides a matching contribution in the Elective Deferred Compensation Plan to any participant who defers to the Elective Deferred Compensation Plan based upon the lesser of (a) 3% of the participant’s total cash compensation or (b) 50% of total deferrals to the 401(k) and the Elective Deferred Compensation Plans combined, less any matching contributions made to the participant’s 401(k) plan. |  |
Deferred compensation expense | 20% per year |  |
Contribution to deferred compensation | 0.1 | 0.1 | 0.1
Deferred Compensation aggregated | 3.5 | 2.9 |
Number of common shares | 500,000 | 500,000 |
Value of common shares | 7.1 | 7.2 |
Vesting of restricted stock grants | 100,000 | 100,000 | 100,000
Deferred compensation obligations for vested restricted stock recorded in equity | 1.1 | 1.8 | 1.4
Reduction of deferred obligation | 1.1 | 1.1 | 2.3
Shares Outstanding Under Directors' Deferred Compensation Plan | 400,000 | 400,000 |
Shares outstanding value under Directors' Deferred Compensation Plan | 6.6 | 5.7 |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of participant's elective deferral | 6.00% |  |
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 4 years |  |
Total unrecognized compensation cost granted | 9.2 |  |
Term of recognition of unrecognized stock option compensation cost | 2 years 1 month 6 days |  |
Restricted common shares | 200,000 | 300,000 | 200,000
Weighted-average fair value of the restricted stock | $ 16.92 |  |
Common shares issued | 100,000 | 100,000 | 100,000
Awards , Grands in period | 237,000 |  |
Restricted Stock Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 9.25 |  |
Restricted Stock Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 16.92 |  |
VSEP grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 7 years |  |
Term of recognition of unrecognized stock option compensation cost | 6 years |  |
Total unrecognized compensation cost granted | 7.3 |  |
Awards , Grands in period | 0 |  |
Performance Period [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 3 years |  |
Additional Vesting [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 4 years |  |
Absolute Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compound annual growth rate | 8.00% |  |
Aggregate percentage of performance awards | 1.4133% |  |
Absolute Performance Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards | 18.0 |  |
Relative Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate percentage of performance awards | 1.9337% |  |
Relative Performance Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards | 36.0 |  |
Stock options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation cost granted | $ 1.9 |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 9 months 18 days |  |

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