Annual report pursuant to Section 13 and 15(d)

Real Estate and Lease Intangibles - Summary of Future Lease Expirations by Year for Properties (Narrative) (Detail)

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Real Estate and Lease Intangibles - Summary of Future Lease Expirations by Year for Properties (Narrative) (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
lease
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Property Subject to or Available for Operating Lease [Line Items]      
Rental revenue $ 17,305,469 $ 11,888,091 $ 7,170,318
2017      
Property Subject to or Available for Operating Lease [Line Items]      
Rental revenue $ 2,296,025    
2017 | Surface Area Lease Property      
Property Subject to or Available for Operating Lease [Line Items]      
Number of leases | lease 1    
Rental revenue $ 32,109