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Long-Term Debt - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended
Jun. 30, 2013
May 29, 2013
Maximum
May 29, 2013
Commercial Paper
Maximum
Debt Instrument [Line Items]      
Debt instrument, principal amount outstanding     $ 750,000,000
Commercial paper maturity   397 days  
Commercial paper notes $ 362,310,000    
Weighted average interest rate 0.37%    
Weighted average maturity period 64 days