Partners' Capital, Equity and Incentive Compensation Plans (Summary of Information About Awards Outstanding) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Operating Partnership [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	1,593,342
QTS Realty Trust, Inc Awards Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	831,734
QTS Realty Trust, Inc Awards Outstanding [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	246,785
Remaining term of awards	3 years
QTS Realty Trust, Inc Awards Outstanding [Member] \| Options to purchase Class A common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower limit of exercise price	21
Upper limit of exercise price	28.82
Awards Outstanding	584,949
Remaining term of awards	2 years
Class O Units [Member] \| Operating Partnership [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower limit of exercise price	20
Upper limit of exercise price	25
Awards Outstanding	1,518,717
Remaining term of awards	1 year
Class RS Units [Member] \| Operating Partnership [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Outstanding	74,625
Remaining term of awards	2 years

Share based compensation arrangement by share based payment award equity instruments other than options outstanding exercise price range lower range limit.

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options outstanding exercise price range upper range limit.

+ References

No definition available.

+ Details

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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