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Weighted Average Grant Date of Sars Granted and Total Intrinsic Value of Sars Exercised (Detail) (Stock Appreciation Rights (SARs), USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Stock Appreciation Rights (SARs)
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, shares 259 215
Weighted average grant-date fair value per SAR $ 5.97 $ 7.10
Intrinsic value of SARs exercised      
Fair value of vested $ 1,388 $ 1,198