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Property Dispositions (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2023 property	Mar. 31, 2024 USD ($) property	Mar. 31, 2023 USD ($)
Discontinued Operation Additional Disclosures
Proceeds from sales of real estate		$ 32,423	$ 0
Loss on sale of real estate, net		$ 15,776	$ 0
Properties Disposed of by Sale
Discontinued Operation Additional Disclosures
Number of properties sold (property) | property	4	2
Proceeds from sales of real estate		$ 42,800
Loss on sale of real estate, net		(15,800)
Loss on sales of investment real estate, tax		$ 100

X

- Definition

Gains Losses On Sales Of Investment Real Estate, Tax

+ References

No definition available.

+ Details

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Namespace Prefix:	nlop_
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Balance Type:	debit
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X

- Definition

The number of properties sold during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	nlop_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- References

No definition available.

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X

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-3

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X

- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

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X

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