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Common Stock and Treasury Stock (Common Stock Repurchase Activity) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Sep. 30, 2012
Aug. 31, 2012
Sep. 30, 2012
Stock Repurchase Program [Line Items]      
Total Number of Shares Purchased 992,014 2,179,900 3,171,914
Average Price Paid per Share $ 11.93 $ 8.88 $ 11.93
Dollar Value of Shares that May Yet Be Purchased $ 68,742 $ 80,599 $ 68,742