CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Comprehensive income:
Net income	$ 217,492	$ 205,456	$ 4,177,723	$ 694,298
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	227	1,908	(4,240)	1,796
Losses reclassified into earnings from other comprehensive income	4,340	4,736	37,262	13,647
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	214	191	264	(311)
Other comprehensive income	4,781	6,835	33,286	15,132
Comprehensive income	222,273	212,291	4,211,009	709,430
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(9,362)	(9,025)	(164,096)	(29,244)
Comprehensive income attributable to controlling interests	212,911	203,266	4,046,913	680,186
ERPOP [Member]
Comprehensive income:
Net income	217,492	205,456	4,177,723	694,298
Other comprehensive (loss) income – derivative instruments:
Unrealized holding (losses) gains arising during the period	227	1,908	(4,240)	1,796
Losses reclassified into earnings from other comprehensive income	4,340	4,736	37,262	13,647
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	214	191	264	(311)
Other comprehensive income	4,781	6,835	33,286	15,132
Comprehensive income	222,273	212,291	4,211,009	709,430
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(823)	(986)	(2,368)	(2,473)
Comprehensive income attributable to controlling interests	$ 221,450	$ 211,305	$ 4,208,641	$ 706,957