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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Per 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]
Shares authorized under stock compensation plans	7.8
Shares authorized under stock compensation plans	Apr. 30, 2020
Stock options vesting period	3 years
Weighted average fair value of options granted (usd per share)	$ 4.56	$ 2.73	$ 3.12
Aggregate intrinsic value of stock options outstanding	$ 6.1
Compensation expense related to share-based compensation plans	2.6	2.0	1.8
Unrecognized compensation cost related to stock options	1.9
Performance share units performance period	1 year
Service requirement	2 years
Percentage of target shares earned	200.00%
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	0.6
Weighted-average recognition period for unrecognized compensation cost	2 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average recognition period for unrecognized compensation cost	2 years
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	3.2	1.8
Weighted-average recognition period for unrecognized compensation cost	1 year 9 months 18 days	2 years
Compensation expense related to share-based compensation plans	$ 1.4	$ 0.6

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Percentage Of Target Shares

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Share Based Compensation Arrangement By Share Based Payment Award, Grant Date Expiration, Month and Year

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Share Based Compensation Arrangement by Share Based Payment Award, Performance Period

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

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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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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 weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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