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Subsequent Events - Additional Information (Detail) - Jul. 29, 2015 - Subsequent Event - USD ($)
$ in Millions
Total
Subsequent Event [Line Items]  
Increase of expenditure limit for the Company's Stock Repurchase Program $ 75.0
Before Amendment  
Subsequent Event [Line Items]  
Stock Repurchase Program limit 400.0
After Amendment  
Subsequent Event [Line Items]  
Stock Repurchase Program limit $ 475.0