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Senior Notes - Schedule of Carrying Amount of Senior Notes (Parenthetical) (Detail)
Mar. 31, 2013
5.375% Senior Notes Due 2014 [Member]
 
Schedule Of Carrying Amount Of Senior Notes [Line Items]  
Senior Notes, interest rate 5.375%
Senior Notes, maturity date 2014
5.375% Senior Notes Due 2015 [Member]
 
Schedule Of Carrying Amount Of Senior Notes [Line Items]  
Senior Notes, interest rate 5.375%
Senior Notes, maturity date 2015
5.625% Senior Notes Due 2020 [Member]
 
Schedule Of Carrying Amount Of Senior Notes [Line Items]  
Senior Notes, interest rate 5.625%
Senior Notes, maturity date 2020
6.000% Senior Notes due 2043 [Member]
 
Schedule Of Carrying Amount Of Senior Notes [Line Items]  
Senior Notes, interest rate 6.00%
Senior Notes, maturity date 2043