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Nonrecourse Debt - Schedule of Minimum Maturities of Nonrecourse Debt (Detail)

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Nonrecourse Debt - Schedule of Minimum Maturities of Nonrecourse Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2015 $ 34,264
Maturity of Nonrecourse debt, 2016 24,703
Maturity of Nonrecourse debt, 2017 23,065
Maturity of Nonrecourse debt, 2018 14,169
Maturity of Nonrecourse debt, 2019 9,537
Maturity of Nonrecourse debt, Thereafter 106,136
Maturity of Nonrecourse debt, Total 211,874
Asset-Backed Nonrecourse Notes [Member]
 
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2015 9,366
Maturity of Nonrecourse debt, 2016 8,014
Maturity of Nonrecourse debt, 2017 8,314
Maturity of Nonrecourse debt, 2018 5,750
Maturity of Nonrecourse debt, 2019 5,157
Maturity of Nonrecourse debt, Thereafter 57,019
Maturity of Nonrecourse debt, Total 93,620
Other Nonrecourse Debt [Member]
 
Debt Instrument [Line Items]  
Maturity of Nonrecourse debt, 2015 24,898
Maturity of Nonrecourse debt, 2016 16,689
Maturity of Nonrecourse debt, 2017 14,751
Maturity of Nonrecourse debt, 2018 8,419
Maturity of Nonrecourse debt, 2019 4,380
Maturity of Nonrecourse debt, Thereafter 49,117
Maturity of Nonrecourse debt, Total $ 118,254