Investment in CT Legacy Asset, at Fair Value - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended					0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Oct. 09, 2013 Subsequent Event [Member]	Sep. 30, 2013 Class A-1 [Member]	Sep. 30, 2013 Common Class A-2 [Member]	Sep. 30, 2013 Common Class B [Member]	Sep. 30, 2013 Former Lenders Under Credit Facility [Member]	Oct. 09, 2013 CT Legacy Partners [Member] Subsequent Event [Member]
Investment [Line Items]
Net investment in CT Legacy Asset		$ 132,000,000
Beneficial ownership of CT Legacy Partners	52.00%						48.00%
Percentage of class B common stock dividends payable to holders	25.00%
Aggregate cash distributions to all other classes of stock	50,000,000
Cumulative preferred stock distributions, amount	1,000,000
Cumulative preferred stock distributions, percent of assets	2.50%
Equity interest in subsidiary, number of shares				4,393,750	775,000	118,651
Common stock, shares outstanding	28,802,000	2,927,000		4,400,000	5,600,000	1,500,000
Distributions to common equity holders			$ 36,200,000					$ 75,000,000