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Credit Facilities and Mortgages Payable - Annual Remaining Principal Payment (Detail) (Limited Partner [Member], Senior Notes [Member], QualityTech, LP [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Limited Partner [Member] | Senior Notes [Member] | QualityTech, LP [Member]
 
Debt Instrument [Line Items]  
2013 $ 536
2014 2,239
2015 72,397
2016 2,567
2017 297,749
Thereafter 233,888
Total $ 609,376