Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Real estate, net		$ 6,928,466	$ 6,996,618
Cash and cash equivalents and restricted cash		522,546	465,324	$ 546,907	$ 331,487
Deferred rent receivable		338,165	330,239
Deferred charges, net		115,658	116,278
Intangible assets, net		127,529	153,519
Other assets		84,220	48,976
Total assets	[1]	8,545,585	8,554,097
Notes and mortgages payable, net		3,834,445	3,800,739
Accounts payable and accrued expenses		117,758	101,901
Intangible liabilities, net		47,855	55,996
Other liabilities		65,413	62,931
Total liabilities	[1]	4,082,368	4,038,363
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		3,437,064	3,470,766
Cash and cash equivalents and restricted cash		206,019	134,647
Investments in unconsolidated joint ventures		70,656	67,505
Accounts and other receivables		3,887	6,871
Deferred rent receivable		202,051	192,401
Deferred charges, net		50,621	55,156
Intangible assets, net		65,742	76,545
Other assets		34,250	21,496
Total assets		4,070,290	4,025,387
Notes and mortgages payable, net		2,487,363	2,457,272
Accounts payable and accrued expenses		59,348	51,590
Intangible liabilities, net		29,084	33,566
Other liabilities		5,842	4,486
Total liabilities		$ 2,581,637	$ 2,546,914

[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 90.9% as of September 30, 2021. As of September 30, 2021, the Operating Partnership includes $4,070,290 and $2,581,637 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 12, Variable Interest Entities (“VIEs”).