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Temporary Equity - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Unit
shares
Dec. 31, 2017
USD ($)
shares
Redeemable Noncontrolling Interest [Line Items]    
Number of insufficient units | Unit 250  
Issued units | shares 25 950
Capital units | $ $ 25,000 $ 950,000
Dividends payable | $ $ 35,713  
Series One Senior Preferred Units [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Authorized units | shares 0 2,245
Units outstanding | shares 0 1,700
Series A Preferred Unit [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Units repurchased | shares 500  
Units repurchased, value | $ $ 500,000  
Units converted | $   $ 1,225