Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Debt instrument amortization period.

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No definition available.

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- Definition

Debt instrument extended maturity date.

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No definition available.

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- Definition

Debt instrument extension period for maturity.

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No definition available.

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- Definition

Debt instrument maximum borrowing capacity.

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No definition available.

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- Definition

Increased borrowing capacity after considering accordion feature.

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No definition available.

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- Definition

Line Of Credit Facility Accordion Feature

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No definition available.

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- Definition

Line of credit facility additional increase in maximum borrowing capacity.

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No definition available.

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- Definition

Credit facility agreement date.

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No definition available.

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- Definition

Line of credit facility extended borrowing capacity.

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No definition available.

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- Definition

Line Of Credit Maximum Borrowing Capacity Including Accordion Option

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No definition available.

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- Definition

Possible increase in borrowing capacity due to accordion feature.

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No definition available.

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- Definition

Range of percentage of escalation interest rate.

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No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Name Regulation S-X (SX)

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-Article 5

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

-Publisher SEC

-Name Regulation S-X (SX)

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-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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No definition available.

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

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No definition available.

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Date the derivative contract matures, in CCYY-MM-DD format.

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No definition available.

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- Definition

Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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No definition available.

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- Definition

General discussion of the entity's interest rate derivative activities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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-Paragraph 19, 22

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- 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.

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No definition available.

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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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.

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Credit Facilities and Mortgages Payable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended					1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended					9 Months Ended			1 Months Ended						1 Months Ended		1 Months Ended		1 Months Ended		9 Months Ended
	Feb. 08, 2012 Limited Partner [Member] Interest Rate Cap [Member]	Feb. 08, 2013 Limited Partner [Member] Interest Rate Cap [Member]	Feb. 08, 2013 Limited Partner [Member] Interest Rate Swap [Member]	Sep. 30, 2013 Limited Partner [Member] Interest Rate Swap [Member]	Sep. 30, 2013 QualityTech, LP [Member]	Sep. 30, 2013 QualityTech, LP [Member] Term Loan [Member]	Sep. 30, 2013 QualityTech, LP [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 QualityTech, LP [Member] Letter of Credit [Member]	May 01, 2013 Unsecured Credit Facility [Member] QualityTech, LP [Member]	Sep. 30, 2013 Unsecured Credit Facility [Member] QualityTech, LP [Member]	Feb. 08, 2012 Secured Credit Facility [Member] QualityTech, LP [Member]	Sep. 30, 2013 Secured Credit Facility [Member] QualityTech, LP [Member]	Dec. 31, 2011 Secured Credit Facility [Member] QualityTech, LP [Member]	Sep. 28, 2010 Secured Credit Facility [Member] QualityTech, LP [Member]	Feb. 08, 2012 Secured Credit Facility [Member] QualityTech, LP [Member] Term Loan [Member]	Feb. 08, 2012 Secured Credit Facility [Member] QualityTech, LP [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 Richmond Credit Facility [Member] QualityTech, LP [Member]	Jan. 31, 2013 Richmond Credit Facility [Member] QualityTech, LP [Member]	Dec. 31, 2012 Richmond Credit Facility [Member] QualityTech, LP [Member]	Dec. 31, 2012 Richmond Credit Facility [Member] QualityTech, LP [Member] Minimum [Member]	Dec. 31, 2012 Richmond Credit Facility [Member] QualityTech, LP [Member] Maximum [Member]	Apr. 30, 2010 Atlanta Metro Equipment Loan [Member] QualityTech, LP [Member]	Apr. 09, 2010 Atlanta Metro Equipment Loan [Member] QualityTech, LP [Member]	Dec. 31, 2012 Miami Loan [Member] QualityTech, LP [Member]	Mar. 30, 2008 Miami Loan [Member] QualityTech, LP [Member]	Sep. 30, 2013 Atlanta-Suwanee Land Loan [Member] QualityTech, LP [Member]	Dec. 31, 2011 Atlanta-Suwanee Land Loan [Member] QualityTech, LP [Member]	May 31, 2013 Lenexa Loan [Member] QualityTech, LP [Member]	Jun. 30, 2011 Lenexa Loan [Member] QualityTech, LP [Member]	Sep. 30, 2013 Santa Clara Bridge Loan [Member] QualityTech, LP [Member]	Nov. 30, 2012 Santa Clara Bridge Loan [Member] QualityTech, LP [Member]	Sep. 30, 2013 Dallas Note [Member] QualityTech, LP [Member]	Sep. 30, 2013 Dallas Note [Member] QualityTech, LP [Member] Minimum [Member]	Sep. 30, 2013 Dallas Note [Member] QualityTech, LP [Member] Maximum [Member]
Debt Instrument [Line Items]
Credit facility agreement date									May 01, 2013			Sep. 28, 2010
Credit Facility maximum borrowing capacity						$ 225	$ 350			$ 575			$ 170	$ 125				$ 100	$ 80
Unsecured Credit Facility term						5 years	4 years
Line of credit accordion feature										100
Increase the amount of line of credit facility										675
Additional letter of credit outstanding								3.5
Increase in Maximum borrowing facility of line of credit											270
Extended maturity date of line of credit facility												Sep. 28, 2014
Amended and extended credit facility											440				125	315
Possible increase in borrowing capacity due to accordion feature											100
Increased borrowing capacity after considering accordion feature												540						125
Derivative instruments, notional amount	150		150
Interest rate, description	One month LIBOR		One month LIBOR
Interest rate cap derivative contract cap rate	2.05%
Derivative instruments, maturity date		Feb. 08, 2013		Sep. 28, 2014
Interest rate cap derivative contract effective date	Feb. 08, 2012		Feb. 08, 2013
Interest rate swap derivative contract interest rate			0.5825%
Credit facility interest rate description																	Interest at variable rates ranging from LIBOR plus 4.0% to LIBOR plus 4.5% (rate at September 30, 2013 was LIBOR plus 4.25%, or 4.43% per annum)
Credit facility base for variable interest rate spread rate																	4.25%			4.00%	4.50%										3.50%
Credit facility base for variable interest rate spread rate																	4.43%
Credit facility, maturity date																	Dec. 18, 2015
Additional extension period credit facility																	1 year
Loan agreement amount of loan																							$ 25.00		$ 32.80		$ 1.60		$ 2.80		$ 50.00	$ 10.25
Loan agreement interest rate					9.00%																		6.85%	7.00%			10.00%		5.43%
Atlanta Metro equipment loan agreement aggregate term of loan																						10 years
Loan agreement, maturity date					Dec. 31, 2013																	Jun. 01, 2020				Sep. 26, 2013		May 26, 2013		May 01, 2013		Dec. 31, 2013
Interest rate description																															LIBOR plus 3.50%
Range of percentage of escalation interest rate																																	2.50%	10.00%
Weighted Average interest rate for Dallas note																																3.25%