Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payments award, number of shares granted	8.9
Equity-based compensation plan expense	$ 6.4	$ 6.8	$ 5.7
Contractual term of stock options, Maximum	10 years
Period for which the options granted are generally vested	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.
Total intrinsic value of options exercised	2.2
Total cash received from employees stock option exercises	1.7	2.0
Measurement dates of the VSEP	Dec. 31, 2012
Percentage of annual increments	20.00%
Percentage of compensation subject to statutory limits	50.00%
Percentage of participant's contribution	50.00%
Percentage of participant's elective deferral	6.00%
Percentage of participant's base salary plus annual cash bonus	3.00%
Percentage of vested contributions	20.00%
Contribution by the company	1.0	1.1	1.1
Non-qualified elective deferred compensation plan	100% of base salaries
Matching contribution to participant	The difference between (a) 3% of the sum of the participant's base salary and annual performance-based bonus deferred under the 401(k) plan and the deferred compensation combined and (b) the actual employer matching contribution under the 401(k) plan.
Deferred compensation expense	20% per year
Contribution to deferred compensation	0.1	0.1	0.1
Deferred Compensation aggregated	2.9	2.7
Number of common shares	0.5	0.4
Value of common shares	7.2	4.9
Vesting of restricted stock grants	0.1	0.1	0.1
Deferred compensation obligations for vested restricted stock recorded in equity	1.8	1.4	1.2
Reduction of deferred obligation	1.1	2.3	5.5
Shares Outstanding Under Directors' Deferred Compensation Plan	0.4	0.3
Shares outstanding value under Directors' Deferred Compensation Plan	5.7	3.7
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for which the options granted are generally vested	4 years
Total unrecognized stock option compensation cost granted	6.8
Term of recognition of unrecognized stock option compensation cost	2 years 3 months 18 days
Restricted common shares	0.3	0.2	0.6
Weighted-average fair value of the restricted stock	$ 13.92
Common shares issued	0.1	0.1	0.1
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	$ 15.36
VSEP awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for which the options granted are generally vested	7 years
Total unrecognized stock option compensation cost granted	3.2
Term of recognition of unrecognized stock option compensation cost	4 years
Weighted-average fair value of the restricted stock	$ 14.98
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock option compensation cost granted	$ 1.7
Term of recognition of unrecognized stock option compensation cost	1 year 9 months 18 days

Deferred Compensation Arrangement For Vested Restricted Stock Recorded In Equity.

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Deferred Compensation Employer Contribution Vesting.

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Defined contribution plan employee contribution maximum.

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Defined contribution plan employer contribution maximum.

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Matching contribution to participant.

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

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Maximum contribution by employer under defined contribution plan as percentage of base salary and cash bonus.

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Measurement dates of value sharing equity program.

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Period for beginning of vesting.

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Permitted deferral percentage.

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Share based compensation arrangement by share based payment award award expiration period.

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

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Shares outstanding under director s deferred compensation plan.

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Shares outstanding under equity deferred compensation plan.

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Shares outstanding value under directors deferred compensation plan.

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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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Vesting of stock under value sharing equity program.

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Vesting percentage of employer contribution.

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The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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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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