Mortgage Loans Payable, Net - Additional Information (Detail) |
Sep. 30, 2017
USD ($)
MortgageLoan
|
Dec. 31, 2016
USD ($)
MortgageLoan
|
Sep. 30, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
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Mortgage Loans on Real Estate [Line Items] | ||||||||
Mortgage loans payable, gross | $ 11,718,000 | $ 3,908,000 | ||||||
Mortgage loans payable, net | $ 11,639,000 | [1] | $ 3,965,000 | [1] | $ 3,847,000 | $ 0 | ||
Number Of Fixed Rate Mortgage Loans Payable | MortgageLoan | 2 | 1 | ||||||
Minimum [Member] | ||||||||
Mortgage Loans on Real Estate [Line Items] | ||||||||
Debt Instrument, Interest Rate, Effective Percentage | 4.77% | 5.25% | ||||||
Maximum [Member] | ||||||||
Mortgage Loans on Real Estate [Line Items] | ||||||||
Debt Instrument, Interest Rate, Effective Percentage | 5.25% | |||||||
Mortgage Loans Payable, Net [Member] | ||||||||
Mortgage Loans on Real Estate [Line Items] | ||||||||
Debt, Weighted Average Interest Rate | 4.92% | |||||||
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