National Storage Affiliates Trust Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Pro Forma Information (Details)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Pro Forma Information (Details) $ in Thousands	2 Months Ended		3 Months Ended									9 Months Ended	12 Months Ended
	Mar. 11, 2016 property	Feb. 29, 2016 property	Dec. 31, 2015 property	Sep. 30, 2015 property	Jun. 30, 2015 property	Mar. 31, 2015 property	Dec. 31, 2014 property	Sep. 30, 2014 property	Jun. 30, 2014 property	Mar. 31, 2014 property	Mar. 31, 2013 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($) property	Dec. 31, 2013 USD ($)	Dec. 31, 2012 property
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue												$ 32,900	$ 147,729	$ 127,943	$ 98,365
Pro forma net income (loss)												(10,500)	$ 15,057	$ (2,220)	(21,890)
Number of businesses acquired for which pro forma financial information is available \| property													42
Number of self storage properties acquired \| property			16	15	21	6	15	31	36	1			58	83		43
Number of businesses acquired for which pro forma financial information is not available \| property													16
Acquisition costs												$ 3,383	$ 4,765	$ 9,558	3,383
Line of Credit [Member] \| Revolving line of credit [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Effective interest rate							2.66%							2.66%
Subsequent Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue													4,348	$ 0	0
Pro forma net income (loss)													(142)	0	0
2015 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue													9,462	22,596	0
Pro forma net income (loss)													10,403	(7,258)	0
2014 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue													0	28,377	46,500
Pro forma net income (loss)													0	21,395	(17,721)
2013 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue													0	0	11,701
Pro forma net income (loss)													0	0	7,565
Consolidated Entities Excluding Acquirees [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue													133,919	76,970	40,164
Pro forma net income (loss)													$ 4,796	$ (16,357)	$ (11,734)
Credit Facility [Member] \| Line of Credit [Member] \| Revolving line of credit [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Effective interest rate			2.03%				2.03%						2.03%	2.03%
Subsequent Event [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of self storage properties acquired \| property		16
Subsequent Event [Member] \| Subsequent Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of businesses acquired for which pro forma financial information is available \| property	9
Number of self storage properties acquired \| property	16
Number of businesses acquired for which pro forma financial information is not available \| property	7
NSA Predecessor [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma revenue											$ 7,300
Pro forma net income (loss)											(1,300)
Acquisition costs											$ 0