Segment Information - Summary of NOI by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Information
Total revenues	$ 465,961	$ 542,048	$ 1,463,732	$ 1,620,303
Operating expenses	226,359	235,575	694,006	709,158
NOI - consolidated	239,602	306,473	769,726	911,145
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(18,096)	(16,943)	(51,915)	(51,415)
Add: NOI from partially owned entities	86,024	60,094	236,400	193,359
NOI at share	307,530	349,624	954,211	1,053,089
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net, and other	(4,037)	(8,743)	530	(39,172)
NOI at share - cash basis	303,493	340,881	954,741	1,013,917
New York
Segment Information
Total revenues	380,568	462,446	1,200,234	1,369,482
Operating expenses	188,159	200,949	574,073	599,768
NOI - consolidated	192,409	261,497	626,161	769,714
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(9,574)	(11,348)	(31,011)	(34,653)
Add: NOI from partially owned entities	82,649	47,179	211,394	146,730
NOI at share	265,484	297,328	806,544	881,791
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net, and other	(5,560)	(9,125)	(3,741)	(39,161)
NOI at share - cash basis	259,924	288,203	802,803	842,630
Other
Segment Information
Total revenues	85,393	79,602	263,498	250,821
Operating expenses	38,200	34,626	119,933	109,390
NOI - consolidated	47,193	44,976	143,565	141,431
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(8,522)	(5,595)	(20,904)	(16,762)
Add: NOI from partially owned entities	3,375	12,915	25,006	46,629
NOI at share	42,046	52,296	147,667	171,298
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net, and other	1,523	382	4,271	(11)
NOI at share - cash basis	$ 43,569	$ 52,678	$ 151,938	$ 171,287