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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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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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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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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		6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Arrangement $ / shares shares	Jun. 30, 2019 USD ($)	Nov. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ATM authorized amount							$ 300,000,000.0
Remaining amount of common stock available for repurchase	$ 224,300,000		$ 224,300,000
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 Arrangement Maturing in Late 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of arrangements \| Arrangement			3
Forward Sale Arrangements Maturing in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of arrangements \| Arrangement			1
Restricted Common Stock
Incentive Plan
Nonvested awards, total compensation cost not yet recognized	$ 7,000,000.0		$ 7,000,000.0
Period for recognition (in years)			1 year 9 months 18 days
Restricted Common Stock \| General and Administrative Expense
Incentive Plan
Compensation expense	$ 2,100,000	$ 2,100,000	$ 5,300,000	$ 5,500,000
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	832,557		832,557
Healthcare Trust of America Holdings, LP (HTALP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend distribution ratio			1