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DEBT - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Interest paid $ 51,000,000 $ 47,500,000 $ 43,500,000
Guaranteed loan, loan balance 4,700,000    
Other Assets [Member]
     
Debt Instrument [Line Items]      
Loan receivable 15,500,000    
$1 billion senior credit facility weighted average rate1.60%, due in 2016 [Member]
     
Debt Instrument [Line Items]      
Maximum borrowing capacity 1,000,000,000    
Senior letters of credit facility, committed to outstanding letters of credit 155,000,000 157,600,000  
Senior letters of credit facility, unused portion 572,600,000 616,500,000  
$100 million private placement notes 5.64%, due in 2015 [Member]
     
Debt Instrument [Line Items]      
Long-term debt, face amount 100,000,000    
$175 million private placement notes 3.89%, due in 2017 [Member]
     
Debt Instrument [Line Items]      
Long-term debt, face amount 175,000,000    
$125 million private placement notes 2.68%, due in 2019 [Member]
     
Debt Instrument [Line Items]      
Long-term debt, face amount 125,000,000    
$225 million private placement notes 4.47%, due in 2020 [Member]
     
Debt Instrument [Line Items]      
Long-term debt, face amount 225,000,000    
$125 million private placement notes 3.26%, due in 2022 [Member]
     
Debt Instrument [Line Items]      
Long-term debt, face amount $ 125,000,000