Investments in Unconsolidated Joint Ventures - Summary of Financial Information of Unconsolidated Joint Ventures (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
Schedule Of Equity Method Investments [Line Items]
Total assets		$ 8,554,097	[1]				$ 8,734,135	[1]				$ 8,554,097	[1]	$ 8,734,135	[1]	$ 8,755,978
Total liabilities	[1]	4,038,363					4,103,173					4,038,363		4,103,173
Equity		3,653,177					3,785,730					3,653,177		3,785,730
Total liabilities and equity		8,554,097					8,734,135					8,554,097		8,734,135
Rental revenue												679,015		709,508		677,138
Total revenues		182,358		$ 176,775	$ 171,118	$ 183,986	186,769		$ 191,253	$ 181,343	$ 184,389	714,237		743,754		707,671
Operating												267,587		264,702		254,697
Depreciation and amortization												235,200		240,104		240,868
Total expenses												568,800		575,361		554,599
Interest and other income, net												4,490		9,844		7,936
Interest and debt expense												(144,208)		(156,679)		(147,653)
Net (loss) income before income taxes												(12,628)		4,520		16,554
Income tax expense												(1,493)		(312)		(3,139)
Net (loss) income attributable to common stockholders		(14,824)		$ (6,958)	$ (6,270)	$ 3,348	(50,145)		$ 7,082	$ 2,455	$ 3,709	(24,704)		(36,899)		9,147
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Real estate, net		2,674,858					2,581,738					2,674,858		2,581,738
Cash and cash equivalents and restricted cash		120,149					75,071					120,149		75,071
Intangible assets, net		110,307					172,041					110,307		172,041
Other assets		45,761					36,218					45,761		36,218
Total assets		2,951,075					2,865,068					2,951,075		2,865,068
Notes and mortgages payable, net		1,801,084					1,648,403					1,801,084		1,648,403
Intangible liabilities, net		26,772					38,377					26,772		38,377
Other liabilities		87,575					65,759					87,575		65,759
Total liabilities		1,915,431					1,752,539					1,915,431		1,752,539
Equity		1,035,644					1,112,529					1,035,644		1,112,529
Total liabilities and equity		$ 2,951,075					$ 2,865,068					2,951,075		2,865,068
Rental revenue												243,713		164,316		140,653
Other income												2,828		2,108		6,827
Total revenues												246,541		166,424		147,480
Operating												109,114		68,491		53,417
Depreciation and amortization												117,640		68,318		48,452
Total expenses												226,754		136,809		101,869
Interest and other income, net												(36)		663		803
Interest and debt expense												(58,239)		(51,113)		(39,406)
Net (loss) income before income taxes												(38,488)		(20,835)		7,008
Income tax expense												(47)		(16)		(10)
Net (loss) income attributable to common stockholders												$ (38,535)		$ (20,851)		$ 6,998

[1] Represents the consolidated assets and liabilities of Paramount Group Operating Partnership LP, a Delaware limited partnership (the “Operating Partnership”). The Operating Partnership is a consolidated variable interest entity (“VIE”), of which we are the sole general partner and own approximately 91.3% as of December 31, 2020. The assets and liabilities of the Operating Partnership, as of December 31, 2020, include $4,025,387 and $2,546,914 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 11, Variable Interest Entities (“VIEs”).