General and Administrative Expenses - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Base management fee, per annum	$ 250,000
Management fee - percent of outstanding Equity balance	1.50%
Incentive fee computation-percent of the product per agreement	20.00%
Incentive fee computation-percent of outstanding Equity per annum	7.00%
Management fees	3,416,000
Manager [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Management fees	3,400,000
Incentive Awards Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Percentage of the dividends paid to common equity holders created employee pool	6.75%
Percentage of granted incentive compensation to employees	92.00%
Percentage of grants vesting schedule	82.00%
Description of incentive management fee grants to employees vesting schedule	(i) 25% vests on the date of grant; (ii) 25% vests in March 2013; (iii) 25% vests in March 2014; and (iv) the remainder vests upon our receipt of distributions from CT Legacy Partners. The remaining 18% of these grants vest upon our receipt of distributions from CT Legacy Partners.
Percentage of grants vesting upon receipt of dividends	18.00%
Accrued payable, awards	$ 7,300,000	$ 5,300,000