Credit Facilities Senior Notes and Mortgage Notes Payable (Richmond Credit Facility Narrative) (Details) (Richmond Credit Facility [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]
Credit facility, maturity date	Jun. 30, 2019
Current revolving credit facility	$ 120
Credit facility, interst rate at end of period	2.27%
Maximum [Member]
Debt Instrument [Line Items]
Increased borrowing capacity after considering accordion feature	$ 200
Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio	2.85%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio	1.85%
Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Leverage ratio	2.10%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Leverage ratio	1.10%

Increased borrowing capacity after considering accordion feature.

No definition available.

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

- 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

- Details

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

- 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

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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: