Annual report pursuant to Section 13 and 15(d)

Debt - Summary of Notes Payable (Detail)

v3.8.0.1
Debt - Summary of Notes Payable (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Debt Instrument [Line Items]    
Total, Notes payable $ 2,486 $ 740
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' interest, spread 1.00%  
Principal on fixed rate notes, amount $ 1,538 $ 722
Variable rate notes issued for redemption of partners' interest, amount 895  
Interest payable $ 53 $ 18