CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Comprehensive income:
Net income	$ 3,731,831	$ 190,224
Other comprehensive income (loss) – derivative instruments:
Unrealized holding (losses) arising during the period	(2,906)	(11,788)
Losses reclassified into earnings from other comprehensive income	28,654	4,338
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	75	(420)
Other comprehensive income (loss)	25,823	(7,870)
Comprehensive income	3,757,654	182,354
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(145,070)	(7,402)
Comprehensive income attributable to controlling interests	3,612,584	174,952
ERPOP [Member]
Comprehensive income:
Net income	3,731,831	190,224
Other comprehensive income (loss) – derivative instruments:
Unrealized holding (losses) arising during the period	(2,906)	(11,788)
Losses reclassified into earnings from other comprehensive income	28,654	4,338
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the period	75	(420)
Other comprehensive income (loss)	25,823	(7,870)
Comprehensive income	3,757,654	182,354
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(764)	(643)
Comprehensive income attributable to controlling interests	$ 3,756,890	$ 181,711