Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property-related revenues	$ 700,410	$ 746,436	$ 740,332
Property-related operating expenses	(273,440)	(274,836)	(274,078)
NOI from unconsolidated joint ventures	48,631	22,409	20,730
NOI	475,601	494,009	486,984
New York [Member]
Segment Reporting Information [Line Items]
Property-related revenues	454,071	482,648	468,013
Property-related operating expenses	(194,648)	(191,211)	(188,008)
NOI from unconsolidated joint ventures	11,540	13,151	20,395
NOI	270,963	304,588	300,400
San Francisco [Member]
Segment Reporting Information [Line Items]
Property-related revenues	234,893	238,808	222,071
Property-related operating expenses	(68,924)	(69,815)	(60,043)
NOI from unconsolidated joint ventures	38,892	9,065
NOI	204,861	178,058	162,028
Other [Member]
Segment Reporting Information [Line Items]
Property-related revenues	11,446	24,980	50,248
Property-related operating expenses	(9,868)	(13,810)	(26,027)
NOI from unconsolidated joint ventures	(1,801)	193	335
NOI	$ (223)	$ 11,363	$ 24,556