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Period Type:

Real Estate and Other Affiliates (Narrative) (Details)		3 Months Ended							9 Months Ended			12 Months Ended
Real Estate and Other Affiliates (Narrative) (Details)	May 23, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018	Jun. 30, 2018 USD ($)	Mar. 31, 2016	Mar. 31, 2015 USD ($) item	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Jul. 16, 2020	Jul. 15, 2020
Real Estate and Other Affiliates
Equity method investment, impairment												$ 0
Investment in real estate and other affiliates		$ 389,882,000							$ 389,882,000			121,757,000
Equity in earnings (losses) from real estate and other affiliates		266,838,000		$ 4,542,000					269,635,000	$ 20,847,000
Assets		9,041,245,000							9,041,245,000			8,413,766,000
Liabilities		5,297,222,000							5,297,222,000			5,080,778,000
110 North Wacker
Real Estate and Other Affiliates
Recourse amount		100,600,000							100,600,000
Variable Interest Entity, Primary Beneficiary
Real Estate and Other Affiliates
Assets												393,300,000
Liabilities												186,500,000
Equity Method Investments
Real Estate and Other Affiliates
Investment in real estate and other affiliates		385,929,000							385,929,000			$ 117,804,000
Equity in earnings (losses) from real estate and other affiliates		266,838,000		4,542,000					265,911,000	17,222,000
Mr. C Seaport \| Equity Method Investments
Real Estate and Other Affiliates
Equity method investment, impairment		0	$ 6,000,000.0	0					6,000,000	0
Equity method investment, ownership percentage														35.00%
Mr. C Seaport \| Equity Method Investments \| Seaport District
Real Estate and Other Affiliates
Equity method investment, ownership percentage												35.00%	0.00%
Investment in real estate and other affiliates		0							0			$ 7,650,000
Equity in earnings (losses) from real estate and other affiliates		0		(545,000)					$ (6,900,000)	(1,628,000)
USAA Joint Venture
Real Estate and Other Affiliates
Contribution of property						$ 33,600,000
Fair value of property contributed						$ 85,000,000.0
Capital contribution to joint venture											$ 9,800,000
Equity ownership in joint venture						23.00%
Preferred return on capital					9.00%
Ownership interest									90.00%
USAA Joint Venture \| USAA
Real Estate and Other Affiliates
Capital contribution to joint venture	$ 178,400,000					$ 64,000,000.0
Joint venture capital obligations	$ 8,800,000					105,600,000
Preferred return on capital					9.00%
Preferred return on capital of cash distribution					11.11%
Ownership interest									10.00%
USAA Joint Venture \| Local Developer [Member]
Real Estate and Other Affiliates
Capital contribution to joint venture						$ 5,000,000					$ 1,100,000
110 North Wacker \| Strategic Developments
Real Estate and Other Affiliates
Equity in earnings (losses) from real estate and other affiliates		267,500,000							$ 267,500,000
110 North Wacker \| Equity Method Investments
Real Estate and Other Affiliates
Investment in real estate and other affiliates		$ 273,600,000							$ 273,600,000
110 North Wacker \| Equity Method Investments \| Operating Assets
Real Estate and Other Affiliates
Equity method investment, ownership percentage		0.00%							0.00%			0.00%
Investment in real estate and other affiliates		$ 273,608,000							$ 273,608,000
110 North Wacker \| Equity Method Investments \| Strategic Developments
Real Estate and Other Affiliates
Equity in earnings (losses) from real estate and other affiliates		$ 267,518,000							$ 267,518,000
Bar Wavo
Real Estate and Other Affiliates
Preferred return on capital of cash distribution							75.00%
Joint venture real estate, percentage funded							89.75%
Preferred return on capital							10.00%
Join venture real estate, remaining cash distribution percentage							50.00%
Bar Wavo \| Momofuku
Real Estate and Other Affiliates
Preferred return on capital of cash distribution							25.00%
Joint venture real estate, percentage funded							10.25%
Bar Wavo \| Equity Method Investments \| Seaport District
Real Estate and Other Affiliates
Equity method investment, ownership percentage		0.00%							0.00%			0.00%
Investment in real estate and other affiliates		$ 6,963,000							$ 6,963,000			$ 7,469,000
Equity in earnings (losses) from real estate and other affiliates		(288,000)		(160,000)					(2,064,000)	(160,000)
The Summit
Real Estate and Other Affiliates
Preferred return on capital								5.00%
Cash distribution entitlement by the joint venture \| item								2
The Summit \| Equity Method Investments
Real Estate and Other Affiliates
Contribution of property								$ 13,400,000
SID bonds transferred to joint venture								1,300,000
Transaction value of land contributed to joint venture								125,400,000
Transactional value per acre of land contributed to joint venture								226,000
Maximum contribution required to joint venture by co-venturer								$ 30,000,000.0
Unconsolidated Properties
Real Estate and Other Affiliates
Secured debt real estate affiliates		491,400,000							491,400,000
Share of entity in secured debt		252,500,000							252,500,000
Other land, rental and property revenues
Real Estate and Other Affiliates
Revenues		35,748,000		$ 63,801,000					82,092,000	$ 165,054,000
Other land, rental and property revenues \| 110 North Wacker \| Strategic Developments
Real Estate and Other Affiliates
Revenues		$ 15,400,000							$ 15,400,000