Loans Receivable, At Fair Value - Schedule of Loans Receivable on Nonaccrual Status (Detail) (CT Legacy Partners [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Subordinated Interests in Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 43,448
Fair Value
Mezzanine and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	69,146
Fair Value	11,899
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	112,594
Fair Value	$ 11,899