Variable Interest Entities - Summary of Assets and Liabilities of Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Real estate, net		$ 7,841,530		$ 7,530,932
Cash and restricted cash		31,044		29,374		$ 41,823	$ 55,728
Preferred equity investments, net		35,817		55,051
Accounts and other receivables, net		17,082		15,251
Deferred rent receivable		220,826		163,695
Deferred charges, net		98,645		71,184
Intangible assets, net		352,206		412,225
Other assets		20,076		22,829
Total assets		8,917,661	[1]	8,867,168	[1]	$ 8,794,143
Notes and mortgages payable, net		3,583,100		3,408,179
Accounts payable and other accrued expenses		117,630		103,896
Intangible liabilities, net		130,028		153,018
Other liabilities		54,109		76,959
Total liabilities	[1]	3,895,577		3,981,221
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Real estate, net		1,726,800		1,336,810
Cash and restricted cash		55,658		17,054
Investments in unconsolidated joint ventures		16,031
Preferred equity investments, net		35,817		55,051
Accounts and other receivables, net		2,550		695
Deferred rent receivable		44,000		32,103
Deferred charges, net		8,123		5,966
Intangible assets, net		66,112		52,139
Other assets		929		14,474
Total assets		1,956,020		1,514,292
Notes and mortgages payable, net		1,196,607		872,960
Accounts payable and other accrued expenses		21,211		21,077
Intangible liabilities, net		46,365		48,654
Other liabilities		155		27,782
Total liabilities		$ 1,264,338		$ 970,473

[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 90.7%, as of December 31, 2017. The assets and liabilities of the Operating Partnership, as of December 31, 2017, include $1,956,020 and $1,264,338 of assets and liabilities, respectively, of certain VIEs that are consolidated by the Operating Partnership. See Note 13, Variable Interest Entities.