Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.4.0.3
Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 26, 2016
USD ($)
Facility
Apr. 13, 2016
USD ($)
Facility
May. 02, 2016
Facility
Mar. 31, 2016
USD ($)
Facility
Apr. 01, 2016
$ / shares
Dec. 31, 2015
USD ($)
Subsequent Event [Line Items]            
Dividend declared, date       Apr. 01, 2016    
Dividend paid, date       Apr. 26, 2016    
Dividend record, date       Apr. 14, 2016    
Line of credit balance outstanding after funding of six acquisitions       $ 141,000   $ 79,000
Number of self-storage facilities under contract to be sold | Facility       13    
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Dividend per common share | $ / shares         $ 0.95  
Dividend paid $ 37,300          
Repayment of outstanding balance of Notes $ 150,000          
Subsequent Event [Member] | Acquisition 2016 [Member]            
Subsequent Event [Line Items]            
Number of self-storage facilities under contract to be purchased | Facility 6   6      
Line of credit balance outstanding after funding of six acquisitions $ 390,000          
Number of self-storage facilities under contract to be sold | Facility   8        
Sale Price Of Facility   $ 35,000