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Derivatives and Fair Value Disclosures - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 617,895    
Ending balance 673,979 $ 617,895  
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 617,895 25,435 $ (393,288)
Effective portion of changes in fair value of interest swap contracts 56,084 592,460 418,723
Ending balance $ 673,979 $ 617,895 $ 25,435