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Schedule Of Stock Repurchase Program (Detail) (USD $)
 1 Months Ended
Nov. 30, 2013
Feb. 28, 2013
Aug. 31, 2011
Mar. 31, 2011
Aug. 31, 2010
May 31, 2010
Jun. 30, 2014
Stockholders Equity [Line Items]              
Date Authorized 2013-11 2013-02 2011-08 2011-03 2010-08 2010-05  
Amount Authorized $ 300,000,000 $ 200,000,000 $ 200,000,000 $ 100,000,000 $ 100,000,000 $ 100,000,000 $ 1,000,000,000
Date Completed   2013-11 2013-01 2011-09 2011-02 2010-08  
Date Completed ongoing