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
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total, Notes payable $ 5,152 $ 4,124
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 $ 3,297 $ 1,417
Variable rate notes issued for redemption of partners' interests, amount 1,789 2,683
Interest payable $ 66 $ 24