Debt extension period

No definition available.

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

- Definition

The maximum amount of the credit facility after increase, contingent on certain conditions being met.

+ References

No definition available.

+ Details

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

- 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

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)
-URI http://asc.fasb.org/extlink&oid=109500613&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=6879938&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=6877327&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=6876686&loc=d3e534808-122878

+ 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
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: 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=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=99377789&loc=d3e19207-110258

+ Details

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

- 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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMaturingApril272021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMaturingDecember172020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
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_UnsecuredRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Unsecured Credit Facility Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Term Loan Maturing April 27, 2021
Debt Instrument [Line Items]
Maturity date	Apr. 27, 2023
Term Loan Maturing December 17, 2020
Debt Instrument [Line Items]
Maturity date		Dec. 17, 2022
Revolving Credit Facility
Debt Instrument [Line Items]
Maturity date	Dec. 17, 2021
Outstanding debt	$ 81,000	$ 131,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding	$ 4,100
Line of credit facility weighted average interest rate outstanding percentage	3.57%
Unsecured Credit Facility
Debt Instrument [Line Items]
Line of credit facility accordion feature	$ 400,000
Minimum \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.50%
Minimum \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.50%
Minimum \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.55%
Minimum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	0.55%
Maximum \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	2.10%
Maximum \| Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.10%
Maximum \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	2.15%
Maximum \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate	1.15%
Unsecured Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		1,520,000
Debt extension period	1 year
Credit facility maximum borrowing capacity after increase which is contingent on certain conditions	$ 1,920,000
Outstanding debt	$ 781,000
Debt Instrument, Covenant Compliance	the Company was in compliance with all of its covenants
Unsecured Credit Facility \| Term Loan
Debt Instrument [Line Items]
Outstanding debt	$ 700,000
Unsecured Credit Facility \| Term Loan Maturing April 27, 2021
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		350,000
Unsecured Credit Facility \| Term Loan Maturing December 17, 2020
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		350,000
Unsecured Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 820,000
Maturity date		Dec. 17, 2021
Unsecured Credit Facility \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding debt	$ 81,000