Commercial Mortgage Loan - Summary of Commercial Mortgage Loan Portfolio (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Hotel	Aug. 07, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 18,845,053
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	18,845,053
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	19,600,000
Current Face Amount	19,465,000
Carrying Value	$ 18,845,053
Coupon Rate	30-day LIBOR plus 4.50%
Loans receivable basis spread on variable rate	4.50%
Property Size	110 rooms
Number of rooms in hotel	110