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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		12 Months Ended				12 Months Ended
	May 31, 2013 Long Term Incentive Plan [Member]	Dec. 31, 2013 Long Term Incentive Plan [Member]	Dec. 31, 2013 SOSARS [Member]	Dec. 31, 2012 SOSARS [Member]	Dec. 31, 2011 SOSARS [Member]	Dec. 31, 2010 SOSARS [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Performance Share Awards [Member]	Dec. 31, 2012 Performance Share Awards [Member]	Dec. 31, 2011 Performance Share Awards [Member]	Dec. 31, 2013 Restricted Stock Units and Performance Share Awards [Member]	Dec. 31, 2012 Restricted Stock Units and Performance Share Awards [Member]	Dec. 31, 2011 Restricted Stock Units and Performance Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares authorized	1,030,000
Common stock available for future issuance		2,179,443
The vesting graded scale							Over a three, four, and five-year
Cumulative performance targets								3 years
Grants under performance share awards								183,910	161,083	98,187	315,196	209,021	251,031
Percentage of award issued to participants								78.00%
Weighted average grant date fair value								$ 22.34	$ 15.49	$ 12.47
Unrecognized compensation expense for outstanding RSUs and PSAs											$ 7.1
The weighted average remaining period over which the expense will be recognized											2 years 10 months 24 days
Vesting period of stock			3 years
Intrinsic value of SOSARs vested and expected to vest			25.8
The remaining weighted average contractual life of outstanding SOSARs			6 years 6 months
Stock options outstanding			1,977,133	2,121,454	2,298,288	2,061,877
Weighted average exercise price			$ 13.91	$ 12.93	$ 12.35	$ 12.28
Vesting term			10 years
Intrinsic value of outstanding stock options			$ 0.2

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Share based compensation arrangement by share based payment award equity instruments other than options cumulative performance target period.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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