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CONSOLIDATED STATEMENTS OF CAPITAL (LP cube) (CubeSmart, L.P. and Subsidiaries, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Noncontrolling Interests in the Operating Partnership
Mar. 31, 2012
Noncontrolling Interests in the Operating Partnership
Mar. 31, 2013
Total Shareholders' Equity
Mar. 31, 2012
Total Shareholders' Equity
Mar. 31, 2013
Operating Partner
Mar. 31, 2012
Operating Partner
Mar. 31, 2013
Preferred Operating Partner
Dec. 31, 2012
Preferred Operating Partner
Mar. 31, 2012
Preferred Operating Partner
Dec. 31, 2011
Preferred Operating Partner
Mar. 31, 2013
Accumulated Other Comprehensive Loss (Income)
Mar. 31, 2012
Accumulated Other Comprehensive Loss (Income)
Mar. 31, 2013
Noncontrolling Interest in Subsidiaries
Mar. 31, 2012
Noncontrolling Interest in Subsidiaries
Increase (Decrease) in Partners' Capital                                
Balance $ 989,909 $ 995,322     $ 989,791 $ 955,913 $ 1,009,587 $ 968,744         $ (19,796) $ (12,831) $ 118 $ 39,409
Balance (in units)             131,795 122,059 3,100 3,100 3,100 3,100        
Balance of Noncontrolling Interests in the Operating Partnership 47,990   47,990 49,732                        
Issuance of common OP units 1,512       1,512   1,512                  
Issuance of common OP units (in units)             100                  
Issuance of restricted OP units 2 2     2 2 2 2                
Issuance of restricted OP units (in units)             211 234                
Conversion from units to shares 14,601   (14,601)   14,601   14,601                  
Conversion from units to shares (in units)             1,013                  
Exercise of OP unit options 785 768     785 768 785 768                
Exercise of OP unit options (in units)             89 98                
Amortization of restricted OP units 808 170     808 170 808 170                
OP unit compensation expense 221 313     221 313 221 313                
Adjustment for Operating Partnership interest of third parties (2,915) (6,384) 2,915 6,384 (2,915) (6,384) (2,915) (6,384)                
Net (loss) income (1,894) (5,345) (35) (149) (392) (3,843) (392) (3,843)             (1) 734
Net income (loss), including temporary equity (393) (3,109)                            
Other comprehensive gain (loss):                                
Unrealized gain on interest rate swap 1,200 663 22 25 1,200 663             1,200 663    
Unrealized gain (loss) on foreign currency translation (252) 120 (4) 4 (243) 116             (243) 116 (9) 4
Preferred OP unit distributions (1,502) (1,502)     (1,502) (1,502) (1,502) (1,502)                
Common OP unit distributions (14,702) (10,983) (251) (374) (14,702) (9,834) (14,702) (9,834)               (1,149)
Balance 989,274 975,380     989,166 936,382 1,008,005 948,434         (18,839) (12,052) 108 38,998
Balance (in units)             133,208 122,391 3,100 3,100 3,100 3,100        
Balance of Noncontrolling Interests in the Operating Partnership $ 36,036   $ 36,036 $ 55,622