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Stock-Based Compensation - Compensation Expense for Periods, SOSARs (Detail) (SOSARs [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
SOSARs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 398 $ 369 $ 1,198 $ 1,095