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Maximum annual cash bonus as percentage of base salary and cash bonus.

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Share based compensation arrangement by share based payment award vesting ratio.

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Shares outstanding under equity deferred compensation plan.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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-Topic 710

-SubTopic 10

-Section 30

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The amount of the cost recognized during the period for defined contribution plans.

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-SubTopic 70

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Unrecognized cost of unvested share-based compensation awards.

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-Topic 718

-SubTopic 10

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments award, number of shares available for grant	6,800,000
Compensation fully earned and vested description	The 2013 VSEP awards, if earned, may result in the granting of common shares of the Company to participants on measurement dates over the three-year term, subject to an additional four-year service-based vesting schedule. As a result, in general, the total compensation available to participants under the 2013 VSEP will be fully earned and vested only after seven years or December 31, 2019.
Non-qualified elective deferred compensation plan	100% of their base salaries, commissions 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 (1) 3% of the participant’s total cash compensation or (2) 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.
Contribution to deferred compensation	$ 0.1	$ 0.1	$ 0.1
Deferred Compensation aggregated	3.7	3.5
Number of common shares	500,000	500,000
Vesting of restricted stock grants	100,000	100,000	100,000
Deferred compensation obligations for vested restricted stock recorded in equity	1.1	1.1	1.8
Reduction of deferred obligation	1.3	1.1	1.1
401K Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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	20.00%
Contribution by the company	1.1	1.1	1.0
Elective Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested contributions	20.00%
Equity Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of common shares	8.3	7.1
Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of common shares	8.8	6.6
Shares Outstanding Under Directors' Deferred Compensation Plan	500,000	400,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of participant's elective deferral	6.00%
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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.
Total unrecognized compensation cost granted	1.9
Term of recognition of unrecognized stock option compensation cost	1 year 9 months 18 days
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	4 years
Total unrecognized compensation cost granted	12.2
Term of recognition of unrecognized stock option compensation cost	2 years 3 months 18 days
Restricted common shares	300,000	200,000	300,000
Weighted-average fair value of the restricted stock	$ 17.43
Common shares issued	100,000	100,000	100,000
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
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