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
12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Debt Instrument [Line Items]    
Total, Notes payable $ 2,486 $ 731
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, spread 1.00%  
Principal on fixed rate notes, amount $ 1,538 $ 722
Variable rate notes issued for redemption of partners' interests, amount 895  
Interest payable $ 53 $ 9