ORGANIZATION AND NATURE OF OPERATIONS (Details)
$ / shares in Units, storage_unit in Thousands, $ in Thousands, ft² in Millions |
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3 Months Ended |
9 Months Ended |
10 Months Ended |
12 Months Ended |
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May. 18, 2015
USD ($)
shares
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Apr. 28, 2015
$ / shares
shares
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Apr. 01, 2014
property
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Jun. 10, 2013
property
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Jun. 07, 2013
USD ($)
shares
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Apr. 01, 2013
property
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Feb. 13, 2013 |
Mar. 31, 2013
entity
property
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Dec. 31, 2013
USD ($)
shares
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Mar. 31, 2014
property
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Dec. 31, 2015
USD ($)
ft²
storage_unit
state
property
$ / shares
shares
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Dec. 31, 2014
USD ($)
$ / shares
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Common shares of beneficial interest, par value (in dollars per share) | $ / shares |
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$ 0.01
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$ 0.01
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| Net proceeds from issuance of common shares in IPO | $ |
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$ 0
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$ 278,070
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$ 0
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| Number of self storage properties owned | property |
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277
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| Number of states that self storage properties are owned in | state |
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16
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| Total rentable square feet in self storage properties | ft² |
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15.8
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| Number of storage units owned | storage_unit |
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123
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| National Storage Affiliates Holdings LLC [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Percentage of NSA owned by NSA Holdings prior to IPO |
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100.00%
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| NSA Predecessor [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Legal entities under common control prior to formation of the Company | entity |
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2
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| Number of self storage properties owned | property |
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110
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| Number of properties contributed | property |
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65
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23
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88
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88
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| Number of properties not meeting criteria for contribution | property |
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22
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22
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| OP units [Member] | NSA OP, LP [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Amount of OP units issued in exchange for common shares from initial public offering (in shares) |
23,000,000
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| OP units [Member] | National Storage Affiliates Holdings LLC [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| OP units owned by NSA Holdings prior to IPO (in shares) |
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126,400
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| Cash purchase price of OP Units held by NSA Holdings | $ |
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$ 600
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| Common Shares [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Shares offered during initial public offering (in shares) |
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1,000
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1,000
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23,000,000
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| Common shares of beneficial interest, par value (in dollars per share) | $ / shares |
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$ 0.01
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| Net proceeds from issuance of common shares in IPO | $ |
$ 278,100
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| Common Shares [Member] | IPO [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Shares offered during initial public offering (in shares) |
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20,000,000
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| IPO share price (in dollars per share) | $ / shares |
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$ 13.00
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| Common Shares [Member] | Over-Allotment Option [Member] |
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| Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |
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| Shares offered during initial public offering (in shares) |
3,000,000
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