Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Assets
Commercial real estate property, net	$ 6,804,052		$ 6,804,052		$ 6,724,007
Cash and cash equivalents	1,015,348	$ 148,978	1,015,348	$ 148,978	166,070
Tenant and other receivables, related party receivables, and deferred rents receivable	90,305		90,305		43,968
Other assets	286,750		286,750		332,801
Liabilities and equity
Mortgages and other loans payable, net	2,316,404		2,316,404		2,183,253
Deferred revenue	99,655		99,655		114,052
Lease liabilities	361,221		361,221		381,671
Other liabilities	240,702		240,702		177,080
Company's investments in unconsolidated joint ventures	2,952,681		2,952,681		2,912,842
Investments difference between carrying amount and underlying equity	122,600		122,600
Combined statements of income for the unconsolidated joint ventures
Operating expenses	40,897	58,317	94,763	116,015
Real estate taxes	41,661	46,694	88,283	93,382
Operating lease rent	7,831	8,298	15,198	16,596
Interest expense, net of interest income	30,070	47,160	67,564	97,685
Amortization of deferred financing costs	2,661	2,712	5,161	5,454
Depreciation and amortization	95,941	69,461	164,220	137,804
Total expenses	249,757	258,383	496,768	518,711
Company's equity in net (loss) income from unconsolidated joint ventures	(2,199)	(7,546)	(15,013)	(12,780)
Joint venture
Assets
Commercial real estate property, net	14,477,628		14,477,628		14,349,628
Cash and cash equivalents	312,875		312,875		336,189
Tenant and other receivables, related party receivables, and deferred rents receivable	381,417		381,417		371,065
Other assets	1,947,757		1,947,757		2,039,429
Total assets	17,119,677		17,119,677		17,096,311
Liabilities and equity
Mortgages and other loans payable, net	9,249,195		9,249,195		8,951,869
Deferred revenue	1,408,880		1,408,880		1,501,616
Lease liabilities	900,463		900,463		897,380
Other liabilities	313,420		313,420		308,304
Equity	5,247,719		5,247,719		5,437,142
Total liabilities and equity	17,119,677		17,119,677		17,096,311
Company's investments in unconsolidated joint ventures	2,952,681		2,952,681		$ 2,912,842
Combined statements of income for the unconsolidated joint ventures
Total revenues	271,518	290,448	554,038	597,967
Operating expenses	35,338	48,514	86,928	102,638
Real estate taxes	51,735	51,987	105,107	106,223
Operating lease rent	6,201	6,234	12,562	12,135
Interest expense, net of interest income	79,638	93,693	165,962	190,316
Amortization of deferred financing costs	4,808	4,782	9,622	9,998
Depreciation and amortization	98,854	103,681	197,438	208,012
Total expenses	276,574	308,891	577,619	629,322
Net loss before gain on sale	(5,056)	(18,443)	(23,581)	(31,355)
Company's equity in net (loss) income from unconsolidated joint ventures	(2,199)	(7,546)	(15,013)	(12,780)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Escalation and reimbursement	$ 1,700	$ 3,900	$ 3,900	$ 6,400