Quarterly report pursuant to Section 13 or 15(d)

Organization - Additional Information (Detail)

v3.4.0.3
Organization - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
States
Property
shares
Dec. 31, 2015
shares
Dec. 31, 2012
Property
Dec. 31, 2011
Property
Dec. 31, 2008
Property
Organization [Line Items]          
Number of self-storage properties owned and managed 562        
Number of states in which self-storage properties owned and managed | States 26        
Number of properties managed with no ownership 16        
Percentage of ownership interest of the subsidiary and its limited partnership which controls the operations of the Operating Partnership 99.50%        
Units of redeemable noncontrolling interest in operating partnership | shares 209,638 168,866      
Noncontrolling limited partnership unit redemption value One common share or cash        
Number of units issued for acquisition | shares 40,772        
Fair value of units, issued for acquisition | $ $ 4,472        
Sovran HHF Storage Holdings LLC [Member]          
Organization [Line Items]          
Number of properties owned and managed under twenty-percent stake joint venture 39       25
Percentage ownership in unconsolidated joint venture 20.00%        
Sovran HHF Storage Holdings II LLC [Member]          
Organization [Line Items]          
Percentage of variable interest ownership in unconsolidated joint venture 15.00%        
Number of properties owned and managed under fifteen-percent stake joint venture 30   10 20  
Uncle Bob's Management, LLC [Member]          
Organization [Line Items]          
Percentage of ownership by subsidiary 60.00%        
Geographic Concentration Risk [Member] | Texas and Florida [Member] | Revenue [Member]          
Organization [Line Items]          
Concentration risk, percentage 41.00%        
Geographic Concentration Risk [Member] | Houston Texas [Member] | Revenue [Member]          
Organization [Line Items]          
Concentration risk, percentage 10.00%