Mortgages and Notes Payable - Summary of Extinguished Mortgages (Detail) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
Mortgage
|
Dec. 31, 2018
USD ($)
Mortgage
|
Dec. 31, 2017
USD ($)
Mortgage
|
|
| Debt Disclosure [Abstract] | |||
| Number of mortgages | Mortgage | 4 | 2 | 7 |
| Outstanding balance of mortgages | $ | $ 13,905 | $ 6,666 | $ 48,108 |