Fair Values - Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gain on investments at fair value	$ 464	$ 4,464
Loans Held-for-Sale, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period
Consolidation of CT Legacy Partners
Transfer from loans receivable, net		2,000
Transfer from loans receivable, at fair value
Deferred interest
Proceeds from investments		(3,200)
Valuation allowance on loans held-for-sale		1,200
Unrealized gain on investments at fair value
End of Period
Loans Receivable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period
Consolidation of CT Legacy Partners		150,332
Transfer from loans receivable, net
Transfer from loans receivable, at fair value		(6,813)
Deferred interest		325
Proceeds from investments		(81,680)
Valuation allowance on loans held-for-sale
Unrealized gain on investments at fair value		3,899
End of Period	66,063	66,063
Other Assets, at Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period
Consolidation of CT Legacy Partners		15,761
Transfer from loans receivable, net
Transfer from loans receivable, at fair value		6,813
Proceeds from investments		(3,867)
Valuation allowance on loans held-for-sale
Unrealized gain on investments at fair value		565
End of Period	19,272	19,272
Investment in CT Legacy Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period		132,000
Consolidation of CT Legacy Partners		(132,000)
Transfer from loans receivable, net
Transfer from loans receivable, at fair value
Deferred interest
Proceeds from investments
Valuation allowance on loans held-for-sale
Unrealized gain on investments at fair value
End of Period