Fair Value Measurements - Quantitative Information (Details) - Significant Unobservable Inputs	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	6.00%
Discount rate	6.75%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 80.00
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 90.00
2200 Channahon Road
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	9.25%
Discount rate	10.50%
2200 Channahon Road | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 2.00
2200 Channahon Road | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 3.00
Houston Westway I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	7.75%
Discount rate	9.00%
Houston Westway I | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 15.00
Houston Westway I | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market rent	$ 17.00