Member Advances and Notes Payable - Additional Information (Detail) (QualityTech, LP [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2013	May 01, 2013
QualityTech, LP [Member]
Related Party Transaction [Line Items]
Amended and Restated Loan From Related Party original principal Amount of loan	$ 20.4
Member Advances original maturity date	Dec. 31, 2013
Interest Rate For Members Advance	9.00%
Amount of unit received in exchange of option exercised in respect of member advances		10
Cancellation of outstanding Members Advance on exercise of option		$ 10

Amended and restated loan from related party original principal amount of loan.

No definition available.

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

- Definition

Amount of unit received in exchange of option exercised in respect of member advances.

+ References

No definition available.

+ Details

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

- Definition

Cancellation of outstanding members advance on exercise of option.

+ References

No definition available.

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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Period Type:	duration