CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Comprehensive income:
Net income	$ 628,381	$ 4,480,104	$ 908,018
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	6,439	(3,915)	2,219
Losses reclassified into earnings from other comprehensive income	18,858	41,758	18,244
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year	0	264	(327)
Other comprehensive income (loss)	25,297	38,107	20,136
Comprehensive income	653,678	4,518,211	928,154
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(25,845)	(189,411)	(38,668)
Comprehensive income attributable to controlling interests	627,833	4,328,800	889,486
ERPOP [Member]
Comprehensive income:
Net income	628,381	4,480,104	908,018
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	6,439	(3,915)	2,219
Losses reclassified into earnings from other comprehensive income	18,858	41,758	18,244
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year	0	264	(327)
Other comprehensive income (loss)	25,297	38,107	20,136
Comprehensive income	653,678	4,518,211	928,154
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(2,323)	(16,430)	(3,657)
Comprehensive income attributable to controlling interests	$ 651,355	$ 4,501,781	$ 924,497