Related Party Transactions - Summary of Related Party Transactions (Detail) (QualityTech, LP [Member], Affiliated Entity [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
QualityTech, LP [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Tax, utility, insurance and other reimbursement	$ 18	$ 20	$ 121	$ 39
Rent expense	264	143	712	429
Capital assets acquired	126	47	141	891
Total	$ 408	$ 210	$ 974	$ 1,359