Debt extension period

No definition available.

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

- Definition

Leverage Ratio Limit Under Existing Revolving Credit Facility

+ References

No definition available.

+ Details

Name:	qts_LeverageRatioLimitUnderExistingRevolvingCreditFacility
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

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

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

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

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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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

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

- Details

Name:	us-gaap_CreditFacilityAxis=qts_TermLoanMember
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:	us-gaap_DebtInstrumentAxis=qts_UnsecuredCreditFacilityMember
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_RangeAxis=us-gaap_MinimumMember
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:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Unsecured Credit Facility Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2014	Jul. 31, 2014	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2013
Term Loan [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 150.0
Letter of credit outstanding			$ 100.0	$ 100.0
Repayment of term loan		$ 75.0
Letter of Credit [Member]
Debt Instrument [Line Items]
Letter of credit outstanding			2.5	2.5
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit outstanding			230.0	230.0
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility agreement date					May 01, 2013
Credit facility maximum borrowing capacity			650.0	650.0	$ 575.0
Maximum the credit facility may be increased up until			$ 850.0	$ 850.0
Line of credit facility weighted average interest rate outstanding percentage			1.87%	1.87%
Unsecured Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 100.0	$ 100.0	$ 225.0
Unsecured credit facility term	5 years		5 years		5 years
Maturity date				Dec. 17, 2019
Unsecured Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 550.0	$ 550.0	$ 350.0
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					$ 100.0
Maturity date				Dec. 17, 2018
Unsecured Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 30.0	$ 30.0
Unsecured Credit Facility [Member] \| Minimum [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio			1.65%	1.65%
Unsecured Credit Facility [Member] \| Minimum [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio			0.65%	0.65%
Unsecured Credit Facility [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio			1.70%	1.70%
Unsecured Credit Facility [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio			0.70%	0.70%
Unsecured Credit Facility [Member] \| Maximum [Member] \| Term Loan [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio			2.20%	2.20%
Unsecured Credit Facility [Member] \| Maximum [Member] \| Term Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio			1.20%	1.20%
Unsecured Credit Facility [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio			2.25%	2.25%
Unsecured Credit Facility [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio			1.25%	1.25%