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Debt - Debt and Capital Lease Obligations Related to Continuing Operations (Parenthetical) (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
$925 Million Credit Facility [Member]
   
Debt Instrument [Line Items]    
Total credit facility $ 925,000,000  
Spread rate added to LIBOR 2.00%  
Spread rate added to bank's base rate 1.25%  
Maturity date for credit facility Aug. 01, 2015  
3.75% Convertible Senior Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate of Senior Notes 3.75%  
Maturity date for Notes Oct. 01, 2014  
Debt discount on Convertible Senior Notes $ 23,369,000 $ 26,961,000
6.75% Senior Notes [Member]
   
Debt Instrument [Line Items]    
Interest rate of Senior Notes 6.75%  
Maturity date for Notes Nov. 15, 2014