Quarterly report pursuant to Section 13 or 15(d)

Debt - Summary of Notes Payable (Detail)

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Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total, Notes payable $ 1,654 $ 2,486
Notes Payable    
Debt Instrument [Line Items]    
Principal on fixed rate notes, interest rate 5.00% 5.00%
Variable rate notes issued for redemption of partners' interests, reference rate Prime  
Variable rate notes issued for redemption of partners' interests, spread 1.00% 1.00%
Principal on fixed rate notes, amount $ 722 $ 1,538
Variable rate notes issued for redemption of partners' interests, amount 895 895
Interest payable $ 37 $ 53