CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 5,385	$ 28,917	$ 25,833	$ 64,541
Other comprehensive income (loss), net of tax:
Unrealized gain on derivative instruments	627	2,782	1,627	3,833
Foreign currency translation adjustments	4,961	(37,821)	15,548	(36,848)
Equity in unrealized income (loss) of an investee	(69)	(146)	(49)	(162)
Total comprehensive income (loss)	10,904	(6,268)	42,959	31,364
Less: comprehensive income attributable to noncontrolling interest in consolidated subsidiary		(9,996)		(19,949)
Comprehensive income (loss) attributable to Equity Commonwealth	$ 10,904	$ (16,264)	$ 42,959	$ 11,415