Summary of Significant Accounting Policies - Summary of Properties (Details) - New Mountain Net Lease Corporation ft² in Thousands, $ in Thousands |
Mar. 31, 2023
USD ($)
ft²
|
|---|---|
| Property, Plant and Equipment [Line Items] | |
| Fair Value | $ 120,623 |
| NM NL Holdings LP / NM GP Holdco LLC | |
| Property, Plant and Equipment [Line Items] | |
| Fair Value | $ 95,605 |
| NM CLFX LP | |
| Property, Plant and Equipment [Line Items] | |
| Total Square Feet | ft² | 423 |
| Fair Value | $ 15,437 |
| NM YI, LLC | |
| Property, Plant and Equipment [Line Items] | |
| Total Square Feet | ft² | 212 |
| Fair Value | $ 9,581 |