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Number of classes of partnership units outstanding.

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Operating partnership units exchange percentage

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Percentage of vesting of award, per quarter, under share-based payment arrangement.

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Represents the percentage of target award under share based compensation.

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Votes per share of class B common stock.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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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Number of options outstanding, including both vested and non-vested options.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Partners' Capital, Equity and Incentive Compensation Plans - Additional Information (Details) $ / shares in Units, $ in Millions					1 Months Ended	9 Months Ended
	Oct. 15, 2020 $ / shares	May 09, 2019 shares	May 04, 2015 shares	Oct. 13, 2013 Vote shares	Mar. 31, 2019	Sep. 30, 2020 USD ($) class shares	Dec. 31, 2019 shares
Partners Capital And Distributions [Line Items]
Options outstanding (in shares)						100,000
Equity based compensation expense unrecognized \| $						$ 31.7
Equity based compensation expense vesting period						7 months 6 days
Performance-Based Relative TSR Units
Partners Capital And Distributions [Line Items]
Vesting period					3 years
Restricted Class A Common Stock
Partners Capital And Distributions [Line Items]
Vesting period						2 years
Class O Units and Options
Partners Capital And Distributions [Line Items]
Equity based compensation awards intrinsic value \| $						$ 50.8
First portion \| Performance-Based FFO Units
Partners Capital And Distributions [Line Items]
Vesting period					2 years
Vesting percentage					67.00%
First portion \| Restricted Class A Common Stock
Partners Capital And Distributions [Line Items]
Vesting period						1 year
Vesting percentage						33.00%
Second portion \| Performance-Based FFO Units
Partners Capital And Distributions [Line Items]
Vesting period					3 years
Vesting percentage					33.00%
Second portion \| Restricted Class A Common Stock
Partners Capital And Distributions [Line Items]
Vesting percentage, per quarter						8.375%
2013 Equity Incentive Plan \| Performance-Based FFO Units
Partners Capital And Distributions [Line Items]
Options outstanding (in shares)						168,552	84,350
2013 Equity Incentive Plan \| Performance-Based Relative TSR Units
Partners Capital And Distributions [Line Items]
Options outstanding (in shares)						168,552	84,350
QualityTech, LP
Partners Capital And Distributions [Line Items]
Number of classes of partnership units outstanding \| class						4
Class B Common Stock
Partners Capital And Distributions [Line Items]
Number of votes per share \| Vote				50
Class B Common Stock \| Chief Executive Officer
Partners Capital And Distributions [Line Items]
Percentage of operating partnership unit exchanged				2.00%
Class A Common Stock \| Performance-Based FFO Units \| Minimum
Partners Capital And Distributions [Line Items]
Percentage of target award					0.00%
Class A Common Stock \| Performance-Based FFO Units \| Maximum
Partners Capital And Distributions [Line Items]
Percentage of target award					200.00%
Class A Common Stock \| Performance-Based Relative TSR Units \| Minimum
Partners Capital And Distributions [Line Items]
Percentage of target award					0.00%
Class A Common Stock \| Performance-Based Relative TSR Units \| Maximum
Partners Capital And Distributions [Line Items]
Percentage of target award					200.00%
Class A Common Stock \| 2013 Equity Incentive Plan
Partners Capital And Distributions [Line Items]
Authorized shares to be issued under the plan				1,750,000
Additional shares available for issuance under plan approved by stockholders		1,110,000	3,000,000
Shares available for issuance		5,860,000
Series A Redeemable Perpetual Preferred Stock \| Subsequent Event
Partners Capital And Distributions [Line Items]
Dividend paid to common stockholders (in dollars per share) \| $ / shares	$ 0.45
Preferred Units Series A [Member] \| QualityTech, LP
Partners Capital And Distributions [Line Items]
Exchange rate for cash or shares						1