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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended
May 08, 2013
Sep. 30, 2013
Jun. 30, 2013
Subsequent Event [Member]
     
Subsequent Event [Line Items]      
Share repurchase program, authorized amount $ 50    
Stock repurchased value   $ 39.5 $ 39.5