Debt extension period

No definition available.

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Period Type:	duration

- Definition

Leverage Ratio Limit Under Existing Revolving Credit Facility

+ References

No definition available.

+ Details

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Namespace Prefix:	qts_
Data Type:	num:percentItemType
Balance Type:	na
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

Credit facility agreement date.

+ References

No definition available.

+ Details

Name:	qts_LineOfCreditFacilityAgreementDate
Namespace Prefix:	qts_
Data Type:	xbrli:dateItemType
Balance Type:	na
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

Line of credit maximum borrowing capacity including accordion option.

+ References

No definition available.

+ Details

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

- Definition

Maximum the credit facility may be increased up until

+ References

No definition available.

+ Details

Name:	qts_MaximumCreditFacilityMayBeIncreasedUpUntil
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

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/presentationRef

-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/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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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

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef

-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

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

- Details

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Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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Debt (Unsecured Credit Facility Narrative) (Details) - USD ($)		1 Months Ended		3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2014	Oct. 31, 2015	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2013	Oct. 01, 2015
Term Loan [Member]
Debt Instrument [Line Items]
Letter of credit outstanding					$ 100,000,000	$ 100,000,000
Richmond Credit Facility [Member]
Debt Instrument [Line Items]
Current revolving credit facility					$ 120,000,000	$ 120,000,000
Line of credit facility weighted average interest rate outstanding percentage					2.29%	2.29%
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding					$ 2,500,000	$ 2,500,000
Line of credit facility weighted average interest rate outstanding percentage					1.89%	1.89%
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit outstanding					$ 300,000,000	$ 300,000,000
Subsequent Event [Member] \| Term Loan Maturing April 27, 2021 [Member]
Debt Instrument [Line Items]
Maturity date		Apr. 27, 2021
Subsequent Event [Member] \| Term Loan Maturing December 20, 2020 [Member]
Debt Instrument [Line Items]
Maturity date		Dec. 17, 2020
Subsequent Event [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding								$ 2,000,000
Subsequent Event [Member] \| Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility accordion feature		$ 200,000,000
Minimum [Member] \| Richmond Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio					1.10%	1.10%
Minimum [Member] \| Subsequent Event [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.50%
Minimum [Member] \| Subsequent Event [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.50%
Minimum [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.55%
Minimum [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		0.55%
Maximum [Member] \| Richmond Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio					1.85%	1.85%
Maximum [Member] \| Subsequent Event [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		2.10%
Maximum [Member] \| Subsequent Event [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.10%
Maximum [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		2.15%
Maximum [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument spread on variable interest rate		1.15%
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility agreement date							May 01, 2013
Credit facility maximum borrowing capacity	$ 650,000,000				$ 650,000,000	$ 650,000,000	$ 575,000,000
Maximum the credit facility may be increased up until					850,000,000	850,000,000
Repayment of debt				$ 75,000,000
Unsecured Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 150,000,000		$ 100,000,000	$ 100,000,000	$ 225,000,000
Unsecured credit facility term	5 years				5 years		5 years
Maturity date						Dec. 17, 2019
Repayment of debt			$ 75,000,000
Unsecured Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 550,000,000				$ 550,000,000	$ 550,000,000	$ 350,000,000
Unsecured credit facility term	4 years				4 years		4 years
Debt extension period	1 year				1 year		1 year
Line of credit facility accordion feature							$ 100,000,000
Maturity date						Dec. 17, 2018
Unsecured Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity					$ 30,000,000	$ 30,000,000
Unsecured Credit Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 900,000,000
Increase the amount of line of credit facility		250,000,000
Unsecured Credit Facility [Member] \| Subsequent Event [Member] \| Term Loan Maturing April 27, 2021 [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		150,000,000
Unsecured Credit Facility [Member] \| Subsequent Event [Member] \| Term Loan Maturing December 20, 2020 [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		150,000,000
Unsecured Credit Facility [Member] \| Subsequent Event [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 600,000,000