Summary of Significant Accounting Policies (Additional Information 2) (Details) (USD $)	3 Months Ended
Mar. 31, 2015 entity segment	Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Outstanding liabilities for the capital leases	$ 13,509,000us-gaap_CapitalLeaseObligations	$ 13,062,000us-gaap_CapitalLeaseObligations
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Number of subsidiaries taxed as taxable REIT	1
Qualitytech, LP [Member]
Summary Of Significant Accounting Policies [Line Items]
Outstanding liabilities for the capital leases	13,509,000	13,062,000
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate allowance for doubtful accounts	$ 3,800,000	$ 3,700,000
Customer One [Member] \| Rental Revenue [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	8.80%
Customer Two [Member] \| Accounts Receivable [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	10.00%
Other Customers [Member] \| Rental Revenue [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue	5.00%
Five Customers [Member] \| Accounts Receivable [Member] \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	5.00%
Five Customers [Member] \| Accounts Receivable [Member] \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of total accounts receivable	67.00%

Number of subsidiaries taxed as taxable REIT.

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Percentage of total accounts receivable.

+ References

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

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

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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-Publisher FASB

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-Topic 840

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-Paragraph 1

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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