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- Definition

Equity Offering Program, Anticipated Proceeds Of Shares Issued

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Equity Offering Program, Available for Issuance

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- Definition

Long-Term Incentive Program [Abstract]

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- Definition

Sale of Stock, Number of Arrangements

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Name Accounting Standards Codification
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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Cash received on stock transaction after deduction of issuance costs.

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Stockholders' Equity and Partners' Capital - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Arrangement $ / shares shares	Sep. 30, 2019 USD ($)	Nov. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount stock repurchase plan	$ 300,000,000.0		$ 300,000,000.0
Remaining amount of available for repurchase	300,000,000.0		300,000,000.0
ATM Offering Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount remaining available for issuance under the new ATM	$ 570,600,000		$ 570,600,000		$ 750,000,000.0
ATM Offering Program \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount remaining available for issuance under the new ATM						$ 500,000,000.0
Issuance of common stock, net (in shares) \| shares			1,700,000
Proceeds from sale of stock			$ 50,000,000.0
Net price per share (in dollars per share) \| $ / shares	$ 29.86		$ 29.86
Forward Sale Arrangements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of arrangements \| Arrangement			4
Anticipated proceeds of share issuance			$ 277,500,000
Forward Sale Arrangements Maturing in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of arrangements \| Arrangement			4
Restricted Common Stock
Incentive Plan
Nonvested awards, total compensation cost not yet recognized	$ 6,200,000		$ 6,200,000
Period for recognition (in years)			1 year 8 months 12 days
Restricted Common Stock \| General and Administrative Expense
Incentive Plan
Compensation expense	$ 1,800,000	$ 2,300,000	$ 7,100,000	$ 7,800,000
2006 Incentive Plan
Incentive Plan
Number of shares authorized (in shares) \| shares	5,000,000		5,000,000
Number of shares available for grant (in shares) \| shares	804,786		804,786
Healthcare Trust of America Holdings, LP (HTALP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend distribution ratio			1