Aggregate cash distributions paid.

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- Definition

Number of classes of partnership units outstanding.

+ References

No definition available.

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- Definition

Operating partnership units exchange percentage

+ References

No definition available.

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- Definition

Votes per share of class B common stock.

+ References

No definition available.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

+ References

No definition available.

+ Details

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(2)(i)-(ii)

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

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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

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Partners' Capital, Equity and Incentive Compensation Plans (Narrative) (Details) (USD $)	3 Months Ended				12 Months Ended	0 Months Ended
	Dec. 31, 2014 item	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014 item	Feb. 23, 2015	Jan. 07, 2015	Oct. 07, 2014
Partners Capital And Distributions [Line Items]
Number of votes per share	50qts_VotesPerShareOfClassBCommonStock				50qts_VotesPerShareOfClassBCommonStock
Equity based compensation expense unrecognized	$ 10,500,000				$ 10,500,000
Equity based compensation expense vesting period					4 years
Equity based compensation awards intrinsic value	31,600,000				31,600,000
Aggregate distribution made to stockholders and partners		10,700,000qts_AggregateCashDistributionsPaid	10,700,000qts_AggregateCashDistributionsPaid
Dividend paid to common stockholders	$ 0.29	$ 0.29	$ 0.29	$ 0.24
Dividends payable, date payable	Oct. 07, 2014	Jul. 08, 2014	Apr. 08, 2014
Subsequent Event [Member]
Partners Capital And Distributions [Line Items]
Aggregate distribution made to stockholders and partners							10,700,000	10,500,000
Dividend paid to common stockholders							$ 0.29
Dividends payable, date payable						Apr. 07, 2015	Jan. 07, 2015
Dividends payable, date declared						Feb. 23, 2015
Cash dividend per common share						$ 0.32
Dividends payable, date of record					Dec. 19, 2014	Mar. 20, 2015
Class O LTIP Holders [Member]
Partners Capital And Distributions [Line Items]
Aggregate distribution made to stockholders and partners			200,000
Class O Units [Member]
Partners Capital And Distributions [Line Items]
Nonvested awards outstanding	700,000				700,000
Class RS Units [Member]
Partners Capital And Distributions [Line Items]
Nonvested awards outstanding	100,000				100,000
Chief Executive Officer [Member]
Partners Capital And Distributions [Line Items]
Percentage of operating partnership unit exchanged					2.00%
Qualitytech, LP [Member]
Partners Capital And Distributions [Line Items]
Number of classes of partnership units outstanding					3
Aggregate distribution made to stockholders and partners				$ 9,000,000
Partnership distribution per unit	$ 0.29	$ 0.29	$ 0.29	$ 0.24
Qualitytech, LP [Member] \| Subsequent Event [Member]
Partners Capital And Distributions [Line Items]
Partnership distribution per unit							$ 0.29
Restricted Class A Common Stock [Member]
Partners Capital And Distributions [Line Items]
Nonvested awards outstanding	200,000				200,000
Options to purchase Class A common stock [Member]
Partners Capital And Distributions [Line Items]
Nonvested awards outstanding	400,000				400,000
2013 Equity Incentive Plan [Member]
Partners Capital And Distributions [Line Items]
Authorized shares to be issued under the plan	1,750,000				1,750,000