Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Property-related revenues	$ 181,318	$ 185,793
Property-related operating expenses	(68,465)	(68,381)
NOI from unconsolidated joint ventures	13,392	5,411
NOI	126,245	122,823
New York [Member]
Segment Reporting Information [Line Items]
Property-related revenues	121,577	121,096
Property-related operating expenses	(49,029)	(48,103)
NOI from unconsolidated joint ventures	2,944	4,657
NOI	75,492	77,650
San Francisco [Member]
Segment Reporting Information [Line Items]
Property-related revenues	56,667	57,184
Property-related operating expenses	(16,919)	(16,346)
NOI from unconsolidated joint ventures	10,382	700
NOI	50,130	41,538
Other [Member]
Segment Reporting Information [Line Items]
Property-related revenues	3,074	7,513
Property-related operating expenses	(2,517)	(3,932)
NOI from unconsolidated joint ventures	66	54
NOI	$ 623	$ 3,635