ORGANIZATION (Details)	3 Months Ended
	Mar. 31, 2013 item property state
ORGANIZATION
Number of operating storage facilities in which the entity has equity interests (in properties)	729
Number of properties owned by franchisees and third parties	236
Number of operating properties owned and/or managed	965
Number of states in which operating storage facilities are located	35
Number of reportable segments	3
Number of tenant accounts that accounts for more than specified percentage of rental income	0
Maximum percentage of rental income accounted for by any single tenant	5.00%