Loans Receivable, at Fair Value - Types of Loans in Loan Portfolio, Property Type and Geographic Distribution of Properties Securing these Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	$ 40,665
CT Legacy Partners [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	40,665	0
Percentage	100.00%
CT Legacy Partners [Member] | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	25,675
Percentage	63.00%
CT Legacy Partners [Member] | Hotel [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	14,990
Percentage	37.00%
CT Legacy Partners [Member] | Senior Mortgages Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	14,990
Percentage	37.00%
CT Legacy Partners [Member] | Subordinate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	25,675
Percentage	63.00%
CT Legacy Partners [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	40,665
Percentage	100.00%
CT Legacy Partners [Member] | Northeast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	25,675
Percentage	63.00%
CT Legacy Partners [Member] | West [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value	$ 14,990
Percentage	37.00%