Organization and Business - Additional Information (Details) ft² in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) ft² Properties Theatre	Sep. 30, 2020 USD ($) ft² Properties Theatre
Real Estate Properties [Line Items]
Number of Real Estate Properties | Properties	14	14
Area of office and retail properties | ft²	13.1	13.1
Percentage of office and retail properties leased	95.50%	95.50%
Number of theatres | Theatre	2	2
Rent collections in excess, percentage	97.50%
Non-cash write-offs, primarily for straight-line rent receivables	$ 14,863,000	$ 26,172,000
Uncollectible accounts receivable		$ 2,051,000
Office Tenants [Member]
Real Estate Properties [Line Items]
Annualized rent		97.00%
Rent collections in excess, percentage	99.00%
Retail, Parking Garages and Two Theatres [Member]
Real Estate Properties [Line Items]
Annualized rent		3.00%
Rent collections in excess, percentage	50.40%
Variable Interest Entities [Member] | Paramount Group Operating Partnership [Member]
Real Estate Properties [Line Items]
Percentage of ownership in operating partnership		91.40%