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Summary of Drawings Under Revolving Credit Facilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Oct. 11, 2011
Line of Credit Facility [Line Items]    
Commitments $ 450,000  
Utilized 122,709  
Available 327,291  
Receivables Credit Facility
   
Line of Credit Facility [Line Items]    
Commitments 200,000 150,000
Utilized 109,000  
Available 91,000  
Revolving Credit Facility
   
Line of Credit Facility [Line Items]    
Commitments 250,000  
Utilized 13,709  
Available $ 236,291