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 $)
6 Months Ended
Jun. 30, 2014
May 09, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Initial Commitment   $ 125,000,000  
Maturity Date May 09, 2014    
Principal Outstanding 44,331,998   43,154,165
Remaining Availability 80,668,002   4,685,000
Mortgage Note Payable [Member]
     
Debt Instrument [Line Items]      
Maturity Date Jan. 05, 2029    
Principal Outstanding 41,331,998    
New Line of Credit [Member]
     
Debt Instrument [Line Items]      
Maturity Date Apr. 05, 2024    
MetLife [Member] | Mortgage Note Payable [Member]
     
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance Dec. 30, 2010    
Initial Commitment 45,200,000 100,000,000  
Maturity Date Jan. 05, 2026    
Principal Outstanding     43,054,165
Stated Interest Rate 3.50%   3.50%
MetLife [Member] | Mortgage Note Payable [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance May 09, 2014    
Initial Commitment 100,000,000    
Maturity Date Jan. 05, 2029    
Principal Outstanding 41,331,998    
Stated Interest Rate 3.50%    
Remaining Availability 58,668,002    
MetLife [Member] | New Line of Credit [Member]
     
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance May 23, 2012    
Initial Commitment 4,785,000 25,000,000  
Maturity Date Apr. 05, 2017    
Principal Outstanding     100,000
Stated Interest Rate     3.25%
Remaining Availability     4,685,000
MetLife [Member] | New Line of Credit [Member] | Maximum [Member]
     
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance May 09, 2014    
Initial Commitment 25,000,000    
Maturity Date Apr. 05, 2024    
Principal Outstanding 3,000,000    
Stated Interest Rate 2.75%    
Remaining Availability $ 22,000,000