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Partners' Capital and Incentive Compensation Plans - Summary of Information About Awards Outstanding (Detail) (QualityTech, LP [Member], USD $)
9 Months Ended
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Outstanding 1,823,075
RS units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price   
Awards Outstanding 175,000
Remaining term of awards 3 years
O units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Lower limit of exercise price $ 20
Upper limit of exercise price $ 25
Awards Outstanding 1,648,075
Remaining term of awards 3 years