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Defined contribution plan employer contribution maximum.

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Share based compensation arrangement by share based payment award award value.

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

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Shares outstanding value under equity deferred compensation plan.

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

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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The number of grants made 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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For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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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