CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 93	$ (6,158)	$ (2,678)	$ (8,961)
Other comprehensive income (loss)
Unrealized loss on derivative contracts	(104)	(1,252)	(1,270)	(1,252)
Reclassification of other comprehensive loss to interest expense	390	281	775	281
Comprehensive income (loss)	379	(7,129)	(3,173)	(9,932)
Comprehensive (income) loss attributable to noncontrolling interests	3,085	7,129	6,637	9,932
Comprehensive income (loss) attributable to National Storage Affiliates Trust	$ 3,464	$ 0	$ 3,464	$ 0