Commercial Mortgage Loan - Summary of Commercial Mortgage Loan Portfolio (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Aug. 07, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 18,006,024
Commercial Mortgage Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Original Face Amount	19,560,000
Current Face Amount	19,465,000
Carrying Value	18,006,024
Atlanta [Member] | Commercial Mortgage Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Date of Investment	2013-08
Maturity Date	2014-03	2014-03
Original Face Amount	19,560,000	19,560,000
Current Face Amount	19,465,000
Carrying Value	$ 18,006,024
Coupon	30-day LIBOR plus 4.50%
Property Size	110 rooms