Loans Receivable, at Fair Value - Overall Statistics for Loans Receivable Portfolio Held at Fair Value (Parenthetical) (Detail) (Minimum [Member])	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor rate	0.20%
LIBOR [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor rate	0.20%
LIBOR [Member] | Floating Rate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor rate	2.00%