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DEBT - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Guaranteed loan, loan balance $ 5.0  
$1 billion senior credit facility weighted average rate 2.02%, due in 2016
   
Debt Instrument [Line Items]    
Senior letters of credit facility, committed to outstanding letters of credit 147.3 157.6
Senior letters of credit facility, unused portion 621.8 616.5
Other Assets [Member]
   
Debt Instrument [Line Items]    
Loan receivable from customer $ 15.5