Dispositions and Discontinued Operations - Additional Information (Details)						12 Months Ended
		Dec. 24, 2020 USD ($) ft²	Sep. 26, 2019 USD ($) ft²	Sep. 27, 2018 USD ($) ft²	Aug. 09, 2018 USD ($) ft²	Dec. 31, 2020 USD ($) ft²	May 27, 2020 USD ($) ft² $ / ft²	Dec. 31, 2019 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of office and retail properties | ft²						12,900,000
Notes and mortgages payable						$ 3,819,434,000		$ 3,809,643,000
1633 Broadway [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale percentage of office and retail properties							10.00%
Area of office and retail properties | ft²							2,500,000
Valuation of office and retail properties							$ 2,400,000,000
Cost per square foot | $ / ft²							960
Notes and mortgages payable							$ 1,250,000,000
Sale agreement amount							$ 111,984,000
Minority interest in joint ventures decrease, percentage						10.00%
1899 Pennsylvania Avenue [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale, net proceeds						$ 14,243,000
Gain (loss) on sale of property	[1]					$ (12,766,000)
1899 Pennsylvania Avenue [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of office and retail properties | ft²		191,000
Sale agreement amount		$ 103,000,000
Sale, net proceeds		89,206,000
Gain (loss) on sale of property		$ (12,766,000)
Liberty Place [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of office and retail properties | ft²			172,000
Sale agreement amount			$ 154,500,000
Gain (loss) on sale of property			$ 1,140,000
425 Eye Street [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of office and retail properties | ft²				373,000
Sale agreement amount				$ 157,000,000
Gain (loss) on sale of property				$ 1,009,000
2099 Pennsylvania Avenue [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of office and retail properties | ft²					209,000
Sale agreement amount					$ 219,000,000
Gain (loss) on sale of property					$ 35,836,000

[1] Represents the loss on sale of 1899 Pennsylvania Avenue in 2020, gain on sale of Liberty Place in 2019, and gain on sale of 425 Eye Street and 2099 Pennsylvania Avenue in 2018.