Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Segment	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount attributable to consolidated VIEs	$ 0		$ 0
Income accrual, description	Income accrual is generally suspended for loans at the earlier of the date at which payments become 90 days past due or when, in the opinion of our Manager, recovery of income and principal becomes doubtful.
Cash and cash equivalents, description	Cash and cash equivalents represent cash held in banks, cash on hand, and liquid investments with original maturities of three months or less.
Expected loss	$ 0
Number of operating segment | Segment	2
General Electrical Capital Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase price of Loan Portfolio		$ 4,700,000,000
Secured Debt Agreements [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized deferred financing costs			12,100,000
Loan Participations Sold [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized deferred financing costs			3,400,000
Convertible Notes [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized deferred financing costs			$ 398,000