Annual report pursuant to Section 13 and 15(d)

Securitization of Receivables - Additional Information (Detail)

v2.4.0.8
Securitization of Receivables - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Sep. 30, 2012
Sep. 30, 2011
Accounts Receivable Securitization [Line Items]          
Gain on securitization of receivables $ 2,534,000 $ 1,940,000 $ 5,597,000 $ 3,912,000 $ 4,025,000
Account receivables managed     2,100,000,000 1,600,000,000  
Securitization credit losses     0 0 0
Asset-backed Securities, Securitized Loans and Receivables [Member]
         
Accounts Receivable Securitization [Line Items]          
Account receivables managed     $ 1,600,000,000 $ 1,400,000,000  
Minimum [Member]
         
Accounts Receivable Securitization [Line Items]          
Annual servicing fees     0.05%    
Maximum [Member]
         
Accounts Receivable Securitization [Line Items]          
Annual servicing fees     0.20%