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Stockholders' Equity - Additional Information (Detail) (Stock Repurchase Plan, USD $)
In Millions, unless otherwise specified
1 Months Ended
Jun. 30, 2012
Stock Repurchase Plan
 
Stockholders Equity [Line Items]  
Board of Directors authorized stock repurchase program $ 250
Stock repurchase remaining authorized amount $ 250
Stock repurchase program, period 2 years