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Summary of Significant Accounting Policies - Financial Instruments Held at Fair Value (Detail) (QualityTech, LP [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial Liabilities:
Interest rate swap liability	$ 547	$ 767
Restricted Deposits [Member] \| Fair Value Measurements, Level 1 [Member]
Financial Assets:
Restricted deposits, held at fair value		146
Interest Rate Swap [Member] \| Fair Value Measurements, Level 2 [Member]
Financial Liabilities:
Interest rate swap liability	547	767
Carrying Value [Member] \| Restricted Deposits [Member]
Financial Assets:
Restricted deposits, held at fair value		146
Carrying Value [Member] \| Interest Rate Swap [Member]
Financial Liabilities:
Interest rate swap liability	$ 547	$ 767

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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