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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net (loss) income attributable to Paramount Group, Inc.	$ (50,145)	$ 7,082	$ 2,455	$ 3,709	$ 5,318	$ 37,531	$ (34,816)	$ 1,114	$ (36,899)	$ 9,147	$ 86,381
Book to tax differences:
Straight-lining of rents and amortization of above and below-market leases, net									(37,244)	(48,604)	(44,083)
Depreciation and amortization									79,750	92,512	96,991
Stock-based compensation									20,812	17,847	14,441
Real estate impairment loss									38,237	41,788
Gain on sale of real estate									12,107	(14,381)	(95,182)
Earnings of unconsolidated joint ventures, including real estate fund investments									4,597	179	(8,600)
Write-off of preferred equity investment										(3,574)	4,327
Unrealized gain on interest rate swaps											(860)
Other, net									8,156	(8,240)	398
Estimated taxable income									$ 89,516	$ 86,674	$ 53,813