National Storage Affiliates Trust Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Cover
- DOCUMENT AND ENTITY INFORMATION
Financial Statements
Notes to Financial Statements
Accounting Policies
- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
Notes Tables
Notes Details

RELATED PARTY TRANSACTIONS (Details)

v3.7.0.1

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Affiliate payroll service fees reimbursed by the Company	$ 19,803	$ 15,457	$ 39,552	$ 28,734
Supervisory and Administrative Fee Agreement [Member] \| Participating Regional Operator [Member] \| Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fees for PROs	3,500	2,700	6,800	4,900
Payroll Services [Member] \| Participating Regional Operator [Member] \| Management [Member]
Related Party Transaction [Line Items]
Affiliate payroll service fees reimbursed by the Company	5,900	4,700	11,700	8,700
Due Diligence Costs [Member] \| Participating Regional Operator [Member] \| Management [Member]
Related Party Transaction [Line Items]
Due diligence expenses payable to the PROs	200		300	$ 300
Due Diligence Costs [Member] \| Participating Regional Operator [Member] \| Management [Member] \| Acquisition Costs [Member]
Related Party Transaction [Line Items]
Due diligence expenses payable to the PROs		$ 200
Customary Fees [Member] \| Equity Method Investee [Member] \| Management Fees And Other Revenue [Member]
Related Party Transaction [Line Items]
Management fees and other revenue from Joint Venture	$ 2,100		$ 4,000
Minimum [Member] \| Supervisory and Administrative Fee Agreement [Member] \| Participating Regional Operator [Member] \| Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent			5.00%
Maximum [Member] \| Supervisory and Administrative Fee Agreement [Member] \| Participating Regional Operator [Member] \| Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent			6.00%

- Definition

Related Party Transaction, Management Agreement, Percent Of Revenue

+ References

No definition available.

+ Details

Name:	nsa_RelatedPartyTransactionManagementAgreementPercentOfRevenue
Namespace Prefix:	nsa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the total of the costs related to real estate revenues, including management, leasing, and development services.

+ References

+ Details

Name:	us-gaap_CostOfRealEstateRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nsa_SupervisoryandAdministrativeFeeAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=nsa_ParticipatingRegionalOperatorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nsa_PayrollServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nsa_DueDiligenceCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=nsa_AcquisitionCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nsa_CustomaryFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_EquityMethodInvesteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=nsa_ManagementFeesAndOtherRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: