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Summary of Significant Accounting Policies - Summary Of Properties (Details) - New Mountain Net Lease Corporation ft² in Thousands, $ in Thousands	Sep. 30, 2022 USD ($) ft²
Property, Plant and Equipment [Line Items]
Fair Value	$ 134,911
NM NL Holdings LP / NM GP Holdco LLC
Property, Plant and Equipment [Line Items]
Fair Value	$ 96,394
NM CLFX LP
Property, Plant and Equipment [Line Items]
Total Square Feet | ft²	423
Fair Value	$ 17,522
NM APP Canada, Corp.
Property, Plant and Equipment [Line Items]
Total Square Feet | ft²	436
Fair Value	$ 11,620
NM YI, LLC
Property, Plant and Equipment [Line Items]
Total Square Feet | ft²	212
Fair Value	$ 9,375

X

- Definition

Area of a real estate property.

+ References

No definition available.

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X

- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- 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

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- Details

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- Details

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