Fair Value Measurement - Additional Information (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Minimum
Fair Value Disclosures
Discount rates used to estimate fair value of mortgages and notes payable	3.00	3.75
Receivables, measurement input	3.00	3.75
Maximum
Fair Value Disclosures
Discount rates used to estimate fair value of mortgages and notes payable	3.10	3.80
Receivables, measurement input	3.10	3.80