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Stock Repurchase Program - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 6 Months Ended
Nov. 30, 2010
Jul. 01, 2012
Stock Repurchase Program    
Stock repurchase program, authorized amount $ 200  
Repurchase of stock, shares   2.6
Repurchase of stock, value   $ 31.2
Common stock average price   $ 11.84