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Segment Disclosures - Profit (Parenthetical) (Detail)
3 Months Ended
Mar. 31, 2013
Segment Reporting, Profit Reconciling Item [Line Items]  
Senior notes interest rate 3.95%
Senior notes maturity period Sep. 15, 2022
Senior Notes due 2022 [Member]
 
Segment Reporting, Profit Reconciling Item [Line Items]  
Senior notes interest rate 3.95%
Senior notes maturity period Sep. 15, 2022