Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt - Additional Information (Detail)

v2.4.0.8
Nonrecourse Debt - Additional Information (Detail) (USD $)
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2013
Asset-Backed Nonrecourse Notes [Member]
Sep. 30, 2014
Asset-Backed Nonrecourse Notes [Member]
Sep. 30, 2014
Asset-Backed Nonrecourse Notes [Member]
Other Assets [Member]
Sep. 30, 2014
Other Nonrecourse Debt [Member]
Dec. 31, 2013
Other Nonrecourse Debt [Member]
Debt Instrument [Line Items]              
Nonrecourse Asset-Backed Notes $ 93,620,000 $ 100,081,000 $ 100,000,000        
Nonrecourse Asset-Backed Notes, interest rate     2.79%        
Nonrecourse Asset-Backed Notes, maturity period     2019-12        
Outstanding Notes     100,100,000 93,600,000      
Amount of financing receivables pledged for Asset-Backed Notes     109,500,000 105,100,000   113,900,000 156,400,000
Anticipated debt balance at maturity     57,000,000        
Prepayment penalty, maturity date     2018-12        
Make whole payment discount rate     0.50%        
Cost on issuance of Notes $ 10,700,000       $ 200,000    
Debt issuance cost amortization period         72 months