Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Summary of Mortgage Note Payable and Line of Credit (Detail)

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Borrowings - Summary of Mortgage Note Payable and Line of Credit (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Mortgage Note Payable [Member]
Mar. 31, 2014
MetLife [Member]
Mortgage Note Payable [Member]
Dec. 31, 2010
MetLife [Member]
Mortgage Note Payable [Member]
Dec. 31, 2013
MetLife [Member]
Mortgage Note Payable [Member]
Mar. 31, 2014
MetLife [Member]
Line of Credit [Member]
Dec. 31, 2013
MetLife [Member]
Line of Credit [Member]
May 31, 2012
MetLife [Member]
Line of Credit [Member]
Debt Instrument [Line Items]                  
Issuer       Metlife     Metlife    
Date of Issuance       Dec. 30, 2010     May 31, 2012    
Initial Commitment     $ 41,331,998 $ 45,200,000     $ 4,785,000   $ 4,800,000
Maturity Date       Jan. 05, 2026 Jan. 05, 2026   Apr. 05, 2017    
Principal Outstanding 41,431,998 43,154,165   41,331,998   43,054,165 100,000 100,000  
Stated Interest Rate       3.50%   3.50% 3.25% 3.25%  
Remaining Availability $ 4,685,000 $ 4,685,000         $ 4,685,000 $ 4,685,000