Transactions with Related Parties - Additional Information (Details) (USD $)	9 Months Ended
	Sep. 30, 2014 Person	Dec. 31, 2013
Related Party Transaction [Line Items]
Number of independent directors	5
Management agreement initial expiration date	2015-02-23
Management agreement additional term of expiration	1 year
Prior notice for uncertain termination (in days)	180 days
Proportion of average annual management fee	400.00%
Period of annual management fees earned (in years)	2 years
Management fee payable	$ 1,672,000	$ 2,752,000
Company's Equity Up To $250 Million
Related Party Transaction [Line Items]
Management fee payable	250,000,000
Management fee bases per annum	1.50%
Company's Equity In Excess Of $250 Million And Up To $500 Million
Related Party Transaction [Line Items]
Management fee payable	500,000,000
Management fee bases per annum	1.10%
Management fee payable, minimum	250,000,000
Company's Equity In Excess Of $500 Million And Up To $750 Million
Related Party Transaction [Line Items]
Management fee payable	750,000,000
Management fee bases per annum	0.80%
Management fee payable, minimum	500,000,000
Company's Equity In Excess Of $750 Million
Related Party Transaction [Line Items]
Management fee payable	$ 750,000,000
Management fee bases per annum	0.50%