Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Stockholders' Equity and Earnings Per Share - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Nov. 30, 2008 2008 Stock Repurchase Program	Nov. 30, 2011 2011 Stock Repurchase Program	Mar. 31, 2013 2012 Stock Repurchase Program	May 31, 2012 2012 Stock Repurchase Program
Stockholders' Equity And Earnings Per Share [Line Items]
Share repurchase, authorized			3,000,000	1,300,000		1,600,000
Remaining shares available for purchase					1,600,000
Anti-dilutive equity-based awards outstanding	297,000	260,000