CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Comprehensive income:
Net income	$ 220,548	$ 149,941
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	6,087
Losses reclassified into earnings from other comprehensive income	4,791	4,583
Other comprehensive income (loss)	10,878	4,583
Comprehensive income	231,426	154,524
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(9,139)	(6,366)
Comprehensive income attributable to controlling interests	222,287	148,158
ERPOP [Member]
Comprehensive income:
Net income	220,548	149,941
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	6,087
Losses reclassified into earnings from other comprehensive income	4,791	4,583
Other comprehensive income (loss)	10,878	4,583
Comprehensive income	231,426	154,524
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(680)	(788)
Comprehensive income attributable to controlling interests	$ 230,746	$ 153,736