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Stock-based Compensation - Additional Information (Detail) (Performance Unit Awards 2010)	3 Months Ended	1 Months Ended
	Mar. 31, 2013	Apr. 30, 2013 Scenario, Forecast
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Performance period	3 years
Award description	Generally, the recipients will receive a target number of shares if the Company's total shareholder return is positive and, when compared to the peer group, is at the 50thpercentile and two times the target if at the 75thpercentile or higher.
Base number of shares	178,750
Shares issued		357,500

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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