Selected Quarterly Financial Data of HTA (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 83,687	$ 82,541	$ 77,244	$ 76,427	$ 73,475	[1]	$ 77,532	[1]	$ 75,697	[1]	$ 70,676	[1]	$ 319,899	$ 297,380	$ 272,177
Income (loss) from continuing operations	3,680	4,625	13,925	1,347	(1,975)	[1]	(3,074)	[1]	(19,458)	[1]	(430)	[1]	23,577	(24,936)	5,173
Income from discontinued operations	382	380	308	37	158	[1]	143	[1]	144	[1]	123	[1]	1,107	568	420
Net income (loss)	4,062	5,005	14,233	1,384	(1,817)	[1]	(2,931)	[1]	(19,314)	[1]	(307)	[1]	24,684	(24,368)	5,593
Net income (loss) attributable to common stockholders/unitholders	$ 4,062	$ 4,823	$ 14,025	$ 1,351	$ (1,836)	[1]	$ (2,952)	[1]	$ (19,322)	[1]	$ (315)	[1]	$ 24,261	$ (24,424)	$ 5,541
Earnings (losses) per common share/unit - basic:
Income (loss) from continuing operations attributable to common stockholders/unitholders (usd per share/unit)	$ 0.02	$ 0.02	$ 0.06	$ 0.01	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.08)	[1]	$ 0.00	[1]	$ 0.10	$ (0.11)	$ 0.02
Discontinued operations (usd per share/unit)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	$ 0.00	$ 0.00
Net income (loss) attributable to common stockholders/unitholders (usd per share/unit)	$ 0.02	$ 0.02	$ 0.06	$ 0.01	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.08)	[1]	$ 0.00	[1]	$ 0.10	$ (0.11)	$ 0.02
Earnings (losses) per common share/unit - diluted:
Income (loss) from continuing operations attributable to common stockholders/unitholders (usd per share/unit)	$ 0.02	$ 0.02	$ 0.06	$ 0.01	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.08)	[1]	$ 0.00	[1]	$ 0.10	$ (0.11)	$ 0.02
Discontinued operations (usd per share/unit)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	$ 0.00	$ 0.00
Net income (loss) attributable to common stockholders/unitholders (usd per share/unit)	$ 0.02	$ 0.02	$ 0.06	$ 0.01	$ (0.01)	[1]	$ (0.01)	[1]	$ (0.08)	[1]	$ 0.00	[1]	$ 0.10	$ (0.11)	$ 0.02

[1] The quarterly amounts differ from the previously reported amounts in our Annual Report on Form 10-K for the year ended December 31, 2012 as a result of discontinued operations of one property classified as held for sale during 2013.