CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income:
Net income	$ 1,009,708	$ 685,192	$ 628,381
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)	5,174	6,439
Losses reclassified into earnings from other comprehensive income	21,188	18,452	18,858
Other comprehensive income (loss)	(12,577)	23,626	25,297
Comprehensive income	997,131	708,818	653,678
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(38,872)	(28,526)	(25,845)
Comprehensive income attributable to controlling interests	958,259	680,292	627,833
ERPOP [Member]
Comprehensive income:
Net income	1,009,708	685,192	628,381
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)	5,174	6,439
Losses reclassified into earnings from other comprehensive income	21,188	18,452	18,858
Other comprehensive income (loss)	(12,577)	23,626	25,297
Comprehensive income	997,131	708,818	653,678
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(3,297)	(2,718)	(2,323)
Comprehensive income attributable to controlling interests	$ 993,834	$ 706,100	$ 651,355