Debt extension period

No definition available.

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Namespace Prefix:	qts_
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Balance Type:	na
Period Type:	duration

- Definition

The aggregate borrowing capacity under the credit facility, consisting of the maximum borrowing capacity plus the contingent increase, 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_LineOfCreditFacilityContingentIncreaseAggregateMaximumBorrowingCapacity
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity in foreign currencies under the credit facility.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityMaximumBorrowingCapacityForeignCurrencies
Namespace Prefix:	qts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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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)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: 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(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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

- 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

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=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
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

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Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=qts_UnsecuredRevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

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- Details

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- Details

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- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=qts_TermLoanMaturingDecember172024Member
Namespace Prefix:
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Balance Type:
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- Details

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- Details

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Debt - Unsecured Credit Facility (Details) - USD ($)	1 Months Ended
Debt - Unsecured Credit Facility (Details) - USD ($)	Oct. 31, 2019	Sep. 30, 2020	Dec. 31, 2019
Unsecured Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,700,000,000
Maximum borrowing capacity in foreign currencies	300,000,000
Maximum borrowing capacity including amount subject to certain conditions	2,200,000,000
Outstanding debt		$ 1,223,000,000.0
Letter of credit outstanding		3,500,000
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 1,000,000,000.0
Debt extension period	1 year
Outstanding debt		522,951,000	$ 317,028,000
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.25%
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.85%
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.25%
Unsecured Credit Facility, Revolving Credit Facility, Matures on December 17, 2023 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.85%
Unsecured Credit Facility, Term Loan
Debt Instrument [Line Items]
Outstanding debt		700,000,000.0
Debt issuance costs, net		5,600,000
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 225,000,000
Outstanding debt		225,000,000	225,000,000
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.20%
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.80%
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.20%
Unsecured Credit Facility, Term Loan A, Matures on December 17, 2024 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.80%
Unsecured Credit Facility, Term Loan B, Matures on April 27 2025
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 225,000,000
Outstanding debt		225,000,000	225,000,000
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 250,000,000
Outstanding debt		$ 250,000,000	$ 250,000,000
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.50%
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.85%
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.50%
Unsecured Credit Facility, Term Loan C, Matures on October 18 2026 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.85%