OTHER NONCONTROLLING INTERESTS (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Feb. 28, 2013 property	Mar. 31, 2013 Other noncontrolling interests property	Mar. 31, 2013 Other noncontrolling interests Minimum	Mar. 31, 2013 Other noncontrolling interests Maximum
Other Noncontrolling Interests
Number of consolidated self-storage properties		3
Number of consolidated self-storage properties under development		2
Ownership interests of third party owners (as a percent)			3.30%	27.60%
Number of joint venture partners in a consolidated self-storage property in which ownership interest was acquired	1
Number of consolidated self-storage properties in which interest was acquired	1
Purchase of capital interest by entity in a joint venture partner of a consolidated property (as a percent)	1.70%
Purchase of profit interest by the entity in a joint venture partner of a consolidated property (as a percent)	17.00%
Cash paid for acquiring interest in a joint venture partner of a consolidated property	$ 200
Ownership interest held by entity in joint venture partner of a consolidated property prior to acquisition (as a percent)	0.95
Ownership interest held by entity in joint venture partner of a consolidated property (as a percent)	0.967