Loans Receivable, at Fair Value - Overall Statistics for Loans Receivable Portfolio Held at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Investment	Dec. 31, 2012 Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net book value	$ 2,047,223	$ 141,500
Weighted-average cash coupon	L+2.23 %
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	31	7
Net book value	2,047,223	141,500
Weighted-average cash coupon	L+4.64 %	L+4.73 %
Weighted-average all-in yield	L+5.26 %	L+4.74 %
CT Legacy Partners [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	7
CT Legacy Partners [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	7
Net book value	40,665
Weighted-average maximum maturity (years)	10 months 24 days
Weighted-average cash coupon	6.24%
Weighted-average all-in yield	6.24%
CT Legacy Partners [Member] | Floating Rate [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	4
Net book value	16,990
Weighted-average cash coupon	L+4.26 %
Weighted-average all-in yield	L+4.26 %
Weighted-average maximum maturity (years)	10 months 24 days
CT Legacy Partners [Member] | Fixed Rate [Member] | Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	3
Net book value	$ 23,675
Weighted-average maximum maturity (years)	9 months 18 days
Weighted-average cash coupon	8.14%
Weighted-average all-in yield	8.14%