Debt extension period

No definition available.

Name:	qts_DebtExtensionPeriod
Namespace Prefix:	qts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of price reduction expressed as a percent.

+ References

No definition available.

+ Details

Name:	qts_DebtInstrumentReductionOfPricePercent
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility accordion feature.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityAccordionFeature
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line Of Credit Facility Weighted Average Percentage Outstanding Interest Rate.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityWeightedAveragePercentageOutstanding
Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

+ References

No definition available.

+ Details

Name:	qts_UnsecuredCreditFacilityContingentIncreaseAdditionalBorrowingCapacity
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentCovenantCompliance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 30
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=qts_OperatingPartnershipQualityTechLpAndQtsFinanceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qts_UnsecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMaturingApril272024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMaturingDecember172023Member
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Debt (Unsecured Credit Facility Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Nov. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Reduction of price, percentage	20.00%
Debt issuance costs, net		$ 6,676	$ 7,671
Operating Partnership Quality Tech LP And QTS Finance Corporation
Debt Instrument [Line Items]
Debt issuance costs, net		4,800
Term Loan
Debt Instrument [Line Items]
Outstanding debt		700,000
Debt issuance costs, net		$ 5,800
Revolving Credit Facility
Debt Instrument [Line Items]
Maturity date		Dec. 17, 2022
Outstanding debt		$ 255,645	$ 252,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding		$ 4,100
Line of credit facility weighted average interest rate outstanding percentage		3.47%
Unsecured Credit Facility
Debt Instrument [Line Items]
Line of credit facility accordion feature		$ 500,000
Minimum \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.30%
Minimum \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.30%
Minimum \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.35%
Minimum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.35%
Maximum \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.90%
Maximum \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.90%
Maximum \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.95%
Maximum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.95%
Unsecured Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 1,520,000
Debt extension period		1 year
Additional contingent borrowing capacity, maximum		$ 2,020,000
Outstanding debt		$ 956,000
Debt Instrument, Covenant Compliance		we were in compliance with all of our covenants
Unsecured Credit Facility \| Term Loan Maturing April 27 2024
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 350,000
Maturity date	Apr. 27, 2024
Unsecured Credit Facility \| Term Loan Maturing December 17 2023
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 350,000
Maturity date	Dec. 17, 2023
Unsecured Credit Facility \| Term Loan Maturing December 17 2022
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 820,000
Maturity date	Dec. 17, 2022
Unsecured Credit Facility \| Maximum
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 200,000