v3.8.0.1

Related Party Transactions - Legal Fees Incurred From The Related Party (Detail) - VNN - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Expenses incurred with related parties	$ 3,075	$ 3,181
General and Administrative
Related Party Transaction [Line Items]
Expenses incurred with related parties	346	604
Legal Services | General and Administrative
Related Party Transaction [Line Items]
Expenses incurred with related parties	324	577
Organization Cost | General and Administrative
Related Party Transaction [Line Items]
Expenses incurred with related parties	22	27
Finance Costs
Related Party Transaction [Line Items]
Expenses incurred with related parties	122	31
Acquisition Fee
Related Party Transaction [Line Items]
Expenses incurred with related parties	2,520	2,383
Legal Services Tenant Related
Related Party Transaction [Line Items]
Expenses incurred with related parties	40	121
Property Disposition Fees
Related Party Transaction [Line Items]
Expenses incurred with related parties	$ 47	$ 42

X

- 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

X

- 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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ck0001424182_VaiseyNicholsonNearpassPLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_LegalServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_OrganizationCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_FinanceFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_AcquisitionFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_TenantRelatedLegalServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ck0001424182_PropertyDispositionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: