Basis of Presentation and Significant Accounting Policies - Summary of Reconciliation Net Income (Loss) Attributable to Estimated Taxable Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net (loss) income attributable to Paramount Group, Inc.	$ (14,824)	$ (6,958)	$ (6,270)	$ 3,348	$ (50,145)	$ 7,082	$ 2,455	$ 3,709	$ (24,704)	$ (36,899)	$ 9,147
Book to tax differences:
Straight-lining of rents and amortization of above and below-market leases, net									(10,462)	(37,244)	(48,604)
Depreciation and amortization									62,002	79,750	92,512
Stock-based compensation									17,766	20,812	17,847
Real estate impairment loss										38,237	41,788
Adjustments resulting from sale of real estate									55,640	12,107	(14,381)
Other, net									(11,095)	12,753	(11,635)
Estimated taxable income									$ 89,147	$ 89,516	$ 86,674