Quarterly report pursuant to Section 13 or 15(d)

Investment in Financing Receivables and Other Investments - Components of Investment in Financing Receivables (Detail)

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Investment in Financing Receivables and Other Investments - Components of Investment in Financing Receivables (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Investment in Financing Receivables    
Financing or minimum lease payments $ 389,078,773 $ 248,126,575
Unearned interest income (87,994,182) (52,174,405)
Unearned fee income, net of initial direct costs (3,765,226) (4,553,453)
Investment in Financing Receivables $ 297,319,365 $ 191,398,717