Per Share Data of HTA (Details) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) Arrangement $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares
Earnings Per Share
Anti-dilutive securities excluded from calculation (in shares)		1,100			800
Numerator:
Net (loss) income | $		$ (6,932)		$ (8,577)	$ 25,001	$ 21,722
Net loss (income) attributable to noncontrolling interests | $	[1]	105		114	(438)	(486)
Net (loss) income attributable to common stockholders/unitholders | $		$ (6,827)		$ (8,463)	$ 24,563	$ 21,236
Denominator:
Weighted average shares/units outstanding - basic (in shares)		218,549		205,277	217,911	205,156
Dilutive shares - partnership units convertible into common stock (in shares)		0		0	3,610	3,870
Adjusted weighted average number of shares/units outstanding — diluted (in shares)		218,549		205,277	221,521	209,026
Earnings per common share - basic
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		$ (0.03)		$ (0.04)	$ 0.11	$ 0.10
Earnings per common share - diluted
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		(0.03)		$ (0.04)	$ 0.11	$ 0.10
Common Stock
Earnings Per Share
Issuance of common stock, net (in shares)			1,675	1,840
Forward Sale Arrangements
Earnings Per Share
Number of arrangements | Arrangement					4
Anticipated proceeds of share issuance | $					$ 277,500
Average price of shares issued (in dollars per share) | $ / shares		$ 29.46			$ 29.46
Forward Sale Arrangements Maturing in 2021
Earnings Per Share
Number of arrangements | Arrangement					4

[1] Includes amounts attributable to redeemable noncontrolling interests for the nine months ended September 30, 2019.