Variable Interest Entities ("VIEs") - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Real estate, net		$ 7,239,357	$ 7,457,012
Cash and restricted cash		323,438	365,409	$ 569,627	$ 250,425
Preferred equity investments			36,042
Accounts and other receivables, net		20,400	20,076
Deferred rent receivable		295,520	267,456
Deferred charges, net		127,427	117,858
Intangible assets, net		222,709	270,445
Other assets		107,334	132,465
Total assets	[1]	8,579,750	8,755,978
Notes and mortgages payable, net		3,576,734	3,566,917
Accounts payable and accrued expenses		119,362	124,334
Intangible liabilities, net		78,836	95,991
Other liabilities		76,768	51,170
Total liabilities	[1]	3,877,007	3,864,314
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		1,685,697	1,699,618
Cash and restricted cash		71,581	63,450
Investments in unconsolidated joint ventures		69,544	52,923
Preferred equity investments			36,042
Accounts and other receivables, net		4,642	2,107
Deferred rent receivable		55,888	51,926
Deferred charges, net		23,461	14,160
Intangible assets, net		33,511	45,818
Other assets		21,718	16,635
Total assets		1,966,042	1,982,679
Notes and mortgages payable, net		1,198,421	1,197,644
Accounts payable and accrued expenses		41,784	24,183
Intangible liabilities, net		22,474	31,582
Other liabilities		13,023	5
Total liabilities		$ 1,275,702	$ 1,253,414

[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 90.2% as of September 30, 2019. The assets and liabilities of the Operating Partnership, as of September 30, 2019, include $1,966,042 and $1,275,702 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 14, Variable Interest Entities (“VIEs”).