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Carrying Value of Senior Notes (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2014
Debt Instrument [Line Items]  
Maturity date of senior notes Aug. 15, 2020
6.375% Senior Notes, due August 2020
 
Debt Instrument [Line Items]  
Percentage of interest rate on notes 6.375%
Maturity date of senior notes Aug. 15, 2020