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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Recognized share-based compensation awards	$ 0.4	$ 0.4	$ 0.9	$ 0.8
Weighted-average fair value of stock options granted			$ 7.15	$ 6.94
Expected Volatility Rate			54.00%	56.00%
Expected Term Period			6 years 6 months	6 years 2 months 12 days
Risk-Free Interest Rate			2.00%	2.20%
Expected dividend rate			1.60%	1.60%
Cash received from employees and directors stock option exercised			$ 0.1	$ 0.8
Intrinsic value of option exercised			$ 0.1	$ 1.2

X

- Definition

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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The cash inflow associated with the amount received from the stock plan during the period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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