CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) income	$ (156,967)	$ (79,845)	$ 109,984
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on derivative instruments	4,918	(828)	(8,840)
Realized gain on sale of investment in available for sale securities			(19)
Foreign currency translation adjustments	(43,718)	6,062	(632)
Equity in unrealized (loss) income of an investee	(132)	47	76
Total comprehensive (loss) income	(195,899)	(74,564)	100,569
Less: comprehensive income attributable to noncontrolling interest in consolidated subsidiary	(20,057)	(15,583)
Comprehensive (loss) income attributable to CommonWealth REIT	$ (215,956)	$ (90,147)	$ 100,569