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Transactions with Affiliated Companies - Fair Value Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,468,996    
Fair value at the ending $ 1,543,910   $ 1,468,996
Nastel Technologies, LLC      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,078    
Discount accretion 4    
Net unrealized gain (loss) 533    
Fair value at the ending $ 7,615   7,078
Second Avenue S F R Holdings I I L L C [ Member]      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,755 $ 2,104 2,104
Purchases (cost)   487  
Net unrealized gain (loss) (12)    
Fair value at the ending $ 4,743 $ 2,591 4,755
S F R Holdco, L L C [ Member]      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments  
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 13,611 $ 9,750 9,750
Purchases (cost) 2,102 327  
Fair value at the ending $ 15,713 $ 10,077 13,611
SheerTrans Solutions, LLC      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 13,744    
Sales and paydowns (cost) (13)    
Discount accretion 6    
Net unrealized gain (loss) 81    
Fair value at the ending $ 13,818   $ 13,744
Investment, Identifier [Axis]: 300 N. Michigan Mezz, LLC (Delayed Draw), Senior Secured Loans, Due 7/15/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MichiganMezzLlcMember   mcip:MichiganMezzLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 974    
Fair value at the ending $ 979   $ 974
Investment, Identifier [Axis]: 95 Percent Buyer, LLC (Revolver), Senior Secured Loans, Due 11/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NinetyFivePercentBuyerLlcMember   mcip:NinetyFivePercentBuyerLlcMember
Investment, Identifier [Axis]: 95 Percent Buyer, LLC, Equity Securites,Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NinetyFivePercentBuyerLlcMember   mcip:NinetyFivePercentBuyerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 580    
Fair value at the ending $ 540   $ 580
Number of units held 385,027   385,027
Investment, Identifier [Axis]: 95 Percent Buyer, LLC, Senior Secured Loans, Due 11/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NinetyFivePercentBuyerLlcMember   mcip:NinetyFivePercentBuyerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 17,905    
Fair value at the ending $ 17,669   $ 17,905
Investment, Identifier [Axis]: API Holdings III Corp, Senior Secured Loans, Due 5/8/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApiHoldingsIiiCorpMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,308    
Fair value at the ending $ 1,173   $ 1,308
Investment, Identifier [Axis]: ASG II, LLC, , Unitranche Loans, Due 5/25/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ASGIILLCMember   mcip:ASGIILLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,000    
Fair value at the ending $ 15,000   $ 15,000
Investment, Identifier [Axis]: ASG II, LLC, Delayed Draw, Unitranche Loans, Due 5/25/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ASGIILLCMember   mcip:ASGIILLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 405    
Fair value at the ending $ 648   $ 405
Investment, Identifier [Axis]: Acquia Inc, Senior Secured Loans, Due 10/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AcquiaIncMember   mcip:AcquiaIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,429    
Fair value at the ending $ 15,429   $ 15,429
Investment, Identifier [Axis]: Acquia Inc. (Revolver), Senior Secured Loans, Due 10/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AcquiaIncMember   mcip:AcquiaIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 346    
Fair value at the ending $ 588   $ 346
Investment, Identifier [Axis]: Adept AG Holdings, LLC (Revolver), Senior Secured Loans, One, Due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:AdeptAgHoldingsLlcMember
Investment, Identifier [Axis]: Adept AG Holdings, LLC (Revolver), Senior Secured Loans, Two, due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember   mcip:AdeptAgHoldingsLlcMember
Investment, Identifier [Axis]: Adept AG Holdings, LLC (Revolver), Senior Secured Loans, due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember    
Investment, Identifier [Axis]: Adept AG Holdings, LLC, Equity Securities, Preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember   mcip:AdeptAgHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 649    
Fair value at the ending $ 495   $ 649
Number of units held     314,584
Number of shares held 314,584    
Investment, Identifier [Axis]: Adept AG Holdings, LLC, Senior Secured Loans, One, Due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:AdeptAgHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 6,445    
Fair value at the ending     $ 6,445
Investment, Identifier [Axis]: Adept AG Holdings, LLC, Senior Secured Loans, Three, due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember   mcip:AdeptAgHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,615    
Fair value at the ending $ 1,590   $ 1,615
Investment, Identifier [Axis]: Adept AG Holdings, LLC, Senior Secured Loans, Two, due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember   mcip:AdeptAgHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 10,724    
Fair value at the ending $ 10,589   $ 10,724
Investment, Identifier [Axis]: Adept AG Holdings, LLC, Senior Secured Loans, due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:AdeptAgHoldingsLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 6,346    
Investment, Identifier [Axis]: Amelia Holding II, LLC (Delayed Draw), Senior Secured Loans, Due 12/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmeliaHoldingIiLlcMember   mcip:AmeliaHoldingIiLlcDelayedDrawMember
Investment, Identifier [Axis]: Amelia Holding II, LLC (Revolver), Senior Secured Loans, Due 12/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmeliaHoldingIiLlcMember   mcip:AmeliaHoldingIiLlcRevolverMember
Investment, Identifier [Axis]: Amelia Holding II, LLC, Equity Securities, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmeliaHoldingIiLlcMember   mcip:AmeliaHoldingIiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 126    
Warrants to purchase percentage of equity 0.10%   0.10%
Investment, Identifier [Axis]: Amelia Holding II, LLC, Senior Secured Loans, Due 12/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmeliaHoldingIiLlcMember   mcip:AmeliaHoldingIiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,700    
Fair value at the ending $ 9,965   $ 9,700
Investment, Identifier [Axis]: American Broadband and Telecommunications Company LLC, Delayed Draw, Senior Loans, Due 6/10/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmericanBroadbandAndTelecommunicationsCompanyLlcMember   mcip:AmericanBroadbandAndTelecommunicationsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,079    
Fair value at the ending $ 2,849   $ 3,079
Investment, Identifier [Axis]: American Broadband and Telecommunications Company LLC, Equity Securities      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmericanBroadbandandTelecommunicationsCompanyLLCMember   mcip:AmericanBroadbandandTelecommunicationsCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 139    
Fair value at the ending $ 130   $ 139
Warrants to purchase percentage of equity 0.40%   0.40%
Investment, Identifier [Axis]: American Broadband and Telecommunications Company LLC, Revolver, Senior Loans, Due 6/10/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AmericanBroadbandAndTelecommunicationsCompanyLlcMember   mcip:AmericanBroadbandAndTelecommunicationsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 236    
Fair value at the ending 242   $ 236
Investment, Identifier [Axis]: American Virtual Cloud Technologies, Inc., Equity Securites, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:AmericanVirtualCloudTechnologiesIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 206    
Fair value at the ending     $ 206
Warrants to purchase percentage of equity     4.90%
Investment, Identifier [Axis]: Aperture Companies, LLC (Revolver), Senior Secured Loans, Due 12/31/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApertureCompaniesLlcMember   mcip:ApertureCompaniesLlcMember
Investment, Identifier [Axis]: Aperture Companies, LLC, Senior Secured Loans, One, Due 12/31/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApertureCompaniesLlcMember   mcip:ApertureCompaniesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,272    
Fair value at the ending $ 14,281   $ 14,272
Investment, Identifier [Axis]: Aperture Companies, LLC, Senior Secured Loans, Two, Due 12/31/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApertureCompaniesLlcMember   mcip:ApertureCompaniesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,142    
Fair value at the ending $ 4,150   $ 4,142
Investment, Identifier [Axis]: Appriss Health, LLC (Revolver), Senior Secured Loans, Due 5/6/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApprissHealthLlcMember   mcip:ApprissHealthLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 217    
Investment, Identifier [Axis]: Appriss Health, LLC, Senior Secured Loans, Due 5/6/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ApprissHealthLlcMember   mcip:ApprissHealthLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 6,497    
Fair value at the ending $ 6,472   $ 6,497
Investment, Identifier [Axis]: Aras Corporation (Revolver), Senior Secured Loans, Due 4/13/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArasCorporationMember   mcip:ArasCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 108    
Fair value at the ending $ 216   $ 108
Investment, Identifier [Axis]: Aras Corporation, Senior Secured Loans, Due 4/13/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArasCorporationMember   mcip:ArasCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,696    
Fair value at the ending $ 4,690   $ 4,696
Investment, Identifier [Axis]: Arcstor Midco, LLC, Senior Secured Loans, Due 3/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArcstorMidcoLLCMember   mcip:ArcstorMidcoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 10,992    
Fair value at the ending $ 10,750   $ 10,992
Investment, Identifier [Axis]: Argano, LLC (Revolver), Senior Secured Loans, Due 6/10/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 496    
Fair value at the ending $ 964   $ 496
Investment, Identifier [Axis]: Argano, LLC, Equity Securites, Common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 418    
Fair value at the ending $ 545   $ 418
Number of units held 59,540   56,839
Investment, Identifier [Axis]: Argano, LLC, Senior Secured Loans, Four, Due 6/10/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,704    
Fair value at the ending $ 4,739   $ 4,704
Investment, Identifier [Axis]: Argano, LLC, Senior Secured Loans, One, Due 6/10/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,885    
Fair value at the ending $ 8,952   $ 8,885
Investment, Identifier [Axis]: Argano, LLC, Senior Secured Loans, Three, Due 6/10/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 682    
Fair value at the ending $ 689   $ 682
Investment, Identifier [Axis]: Argano, LLC, Senior Secured Loans, Two, Due 6/10/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ArganoLlcMember   mcip:ArganoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,934    
Fair value at the ending 3,964   $ 3,934
Investment, Identifier [Axis]: Arizona Natural Resources, LLC (Revolver), Senior Secured Loans, Due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ArizonaNaturalResourcesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,759    
Fair value at the ending     $ 1,759
Investment, Identifier [Axis]: Arizona Natural Resources, LLC (Revolver), Senior Secured Notes, due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ArizonaNaturalResourcesLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,758    
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Loans, Four, Due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ArizonaNaturalResourcesLlcMember
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Loans, One, Due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ArizonaNaturalResourcesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 13,680    
Fair value at the ending     $ 13,680
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Loans, Three, Due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ArizonaNaturalResourcesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 6,812    
Fair value at the ending     $ 6,812
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Loans, Two, Due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ArizonaNaturalResourcesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,511    
Fair value at the ending     $ 2,511
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Notes, Four, due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ArizonaNaturalResourcesLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,958    
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Notes, Three, due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ArizonaNaturalResourcesLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 6,791    
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Notes, Two, due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ArizonaNaturalResourcesLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,504    
Investment, Identifier [Axis]: Arizona Natural Resources, LLC, Senior Secured Notes, due 5/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ArizonaNaturalResourcesLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 13,638    
Investment, Identifier [Axis]: Ascent Midco, LLC (Revolver), Senior Secured Loans, Due 2/5/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AscentMidcoLLCMember   mcip:AscentMidcoLLCMember
Investment, Identifier [Axis]: Ascent Midco, LLC, Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AscentMidcoLLCMember   mcip:AscentMidcoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 703    
Fair value at the ending $ 677   $ 703
Number of shares held 725,806   725,806
Investment, Identifier [Axis]: Ascent Midco, LLC, Senior Secured Loans, Due 2/5/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AscentMidcoLLCMember   mcip:AscentMidcoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,220    
Fair value at the ending $ 2,190   $ 2,220
Investment, Identifier [Axis]: Avalara, Inc, Senior Secured Loans, Due 10/19/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AvalaraInc.Member   mcip:AvalaraIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,750    
Fair value at the ending $ 10,000   $ 9,750
Investment, Identifier [Axis]: Avalara, Inc. (Revolver), Senior Secured Loans, due 10/19/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AvalaraInc.Member   mcip:AvalaraIncMember
Investment, Identifier [Axis]: Avison Young (USA) Inc, Senior Secured Loans, Due 1/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AvisonYoungUSAIncMember   mcip:AvisonYoungUSAIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,612    
Fair value at the ending $ 1,436   $ 1,612
Investment, Identifier [Axis]: Avison Young (USA) Inc, Senior Secured Loans, Due 9/1/2022      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:AvisonYoungUSAIncMember   mcip:AvisonYoungUSAIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,726    
Fair value at the ending $ 3,634   $ 3,726
Investment, Identifier [Axis]: B2B Industrial Products LLC, Senior Secured Loans, due 10/7/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:B2bIndustrialProductsLlcMember   mcip:B2bIndustrialProductsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,750    
Fair value at the ending $ 9,965   $ 9,750
Investment, Identifier [Axis]: BTRS Holdings Inc (Delayed Draw), Senior Secured Loans, Due 12/15/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BtrsHoldingsIncMember   mcip:BtrsHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 100    
Investment, Identifier [Axis]: BTRS Holdings Inc (Revolver), Senior Secured Loans, Due 12/15/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BtrsHoldingsIncMember   mcip:BtrsHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 147    
Investment, Identifier [Axis]: BTRS Holdings Inc, Senior Secured Loans, Due 12/15/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BtrsHoldingsIncMember   mcip:BtrsHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,700    
Fair value at the ending $ 10,000   $ 9,700
Investment, Identifier [Axis]: Bonterra LLC (Delayed Draw), Senior Secured Loans, Due 9/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BonterraLlcMember   mcip:BonterraLLCfkaCybergrantsHoldingsMember
Investment, Identifier [Axis]: Bonterra LLC (Revolver), Senior Secured Loans, Due 9/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BonterraLlcMember   mcip:BonterraLLCfkaCybergrantsHoldingsMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 659    
Fair value at the ending $ 1,744   $ 659
Investment, Identifier [Axis]: Bonterra LLC, Senior Secured Loans, Due 9/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BonterraLlcMember   mcip:BonterraLLCfkaCybergrantsHoldingsMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 18,432    
Fair value at the ending $ 18,433   $ 18,432
Investment, Identifier [Axis]: Born To Run, LLC, Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BornToRunLLCMember   mcip:BornToRunLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 600    
Fair value at the ending $ 285   $ 600
Number of units held     692,841
Number of shares held 692,841    
Investment, Identifier [Axis]: Born To Run, LLC, Senior Secured Loans, One, Due 4/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BornToRunLLCMember   mcip:BornToRunLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,531    
Fair value at the ending $ 8,024   $ 8,531
Investment, Identifier [Axis]: Born To Run, LLC, Senior Secured Loans, Two, Due 4/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BornToRunLLCMember   mcip:BornToRunLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,162    
Fair value at the ending $ 1,093   $ 1,162
Investment, Identifier [Axis]: Brickell Bay Acquisition Corp, Senior Secured Loans, Due 2/12/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BrickellBayAcquisitionCorpMember   mcip:BrickellBayAcquisitionCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,771    
Fair value at the ending $ 2,767   $ 2,771
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Senior Secured Loans, Due 7/25/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:BurgessPointPurchaserCorporationMember   mcip:BurgessPointPurchaserCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,563    
Fair value at the ending $ 4,771   $ 4,563
Investment, Identifier [Axis]: CE Intermediate, LLC, Senior Secured Loans, Due 7/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CeIntermediateLlcMember   mcip:CeIntermediateLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 29,067    
Fair value at the ending $ 29,625   $ 29,067
Investment, Identifier [Axis]: CGI Automated Manufacturing, LLC, Senior Secured Loans, One, due 12/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CgiAutomatedManufacturingLlcMember   mcip:CgiAutomatedManufacturingLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,944    
Fair value at the ending $ 8,788   $ 8,944
Investment, Identifier [Axis]: CGI Automated Manufacturing, LLC, Senior Secured Loans, Three, due 12/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CgiAutomatedManufacturingLlcMember   mcip:CgiAutomatedManufacturingLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 10,890    
Fair value at the ending $ 10,700   $ 10,890
Investment, Identifier [Axis]: CGI Automated Manufacturing, LLC, Senior Secured Loans, Two, due 12/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CgiAutomatedManufacturingLlcMember   mcip:CgiAutomatedManufacturingLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,691    
Fair value at the ending $ 5,592   $ 5,691
Investment, Identifier [Axis]: Calabrio, Inc., Revolver, Senior Loans, Two, Due 4/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CalabrioIncMember   mcip:CalabrioIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 547    
Fair value at the ending $ 548   $ 547
Investment, Identifier [Axis]: Calabrio, Inc., Senior Loans, One, Due 4/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CalabrioIncMember   mcip:CalabrioIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,950    
Fair value at the ending $ 7,960   $ 7,950
Investment, Identifier [Axis]: Calienger Holdings, L.L.C, Senior Secured Loans, Due 10/20/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaliengerHoldingsL.l.cMember   mcip:CaliengerHoldingsL.l.cMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,875    
Fair value at the ending $ 5,000   $ 4,875
Investment, Identifier [Axis]: Calienger Holdings, L.L.C. (Delayed Draw), Senior Secured Loans, Due 10/20/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaliengerHoldingsL.l.cMember   mcip:CaliengerHoldingsL.l.cMember
Investment, Identifier [Axis]: Calienger Holdings, L.L.C. (Revolver), Senior Secured Loans, Due 10/20/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaliengerHoldingsL.l.cMember   mcip:CaliengerHoldingsL.l.cMember
Investment, Identifier [Axis]: Calienger Holdings, L.L.C., Equity Securites, Class A units)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaliengerHoldingsL.l.cMember   mcip:CaliengerHoldingsL.l.cMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 568    
Fair value at the ending $ 614   $ 568
Number of units held 568,181    
Number of shares held     568,181
Investment, Identifier [Axis]: Caravel Autism Health, LLC (Delayed Draw), Senior Secured Loans, Due 6/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaravelAutismHealthLLCMember   mcip:CaravelAutismHealthLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 277    
Fair value at the ending $ 1,358   $ 277
Investment, Identifier [Axis]: Caravel Autism Health, LLC (Revolver), Senior Secured Loans, Due 6/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaravelAutismHealthLLCMember   mcip:CaravelAutismHealthLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,677    
Fair value at the ending $ 1,307   $ 1,677
Investment, Identifier [Axis]: Caravel Autism Health, LLC, Senior Secured Loans, Due 6/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CaravelAutismHealthLLCMember   mcip:CaravelAutismHealthLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,409    
Fair value at the ending $ 7,598   $ 7,409
Investment, Identifier [Axis]: Carrols Restaurant Group Inc, Senior Secured Loans, Due 4/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:CarrolsRestaurantGroupIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 930    
Investment, Identifier [Axis]: Cassavant Holdings, LLC, Unitranche Loans, Due 9/8/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CassavantHoldingsLLCMember   mcip:CassavantHoldingsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 13,013    
Fair value at the ending $ 13,033   $ 13,013
Investment, Identifier [Axis]: Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC (Revolver), Senior Secured Loans, Due 4/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember   mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,488    
Fair value at the ending $ 4,507   $ 3,488
Investment, Identifier [Axis]: Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans, One, Due 4/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember   mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,980    
Fair value at the ending $ 13,500   $ 15,980
Investment, Identifier [Axis]: Centaur (Palm Beach) Owner LLC and Panther National Golf Club LLC, Senior Secured Loans, Two, Due 4/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember   mcip:CentaurPalmBeachOwnerLLCandPantherNationalGolfClubLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,633    
Fair value at the ending $ 1,380   $ 1,633
Investment, Identifier [Axis]: Chess.com, LLC (Revolver), Senior Secured Loans, Due 12/31/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Chess.comLLCMember   mcip:Chess.comLLCMember
Investment, Identifier [Axis]: Chess.com, LLC, Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Chess.comLLCMember   mcip:Chess.comLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 107    
Fair value at the ending $ 107   $ 107
Number of units held 5   5
Investment, Identifier [Axis]: Chess.com, LLC, Senior Secured Loans, Due 12/31/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Chess.comLLCMember   mcip:Chess.comLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,709    
Fair value at the ending $ 12,693   $ 12,709
Investment, Identifier [Axis]: Clydesdale Holdings, LLC, Delayed Draw, Senior Loans, Due 6/23/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ClydesdaleHoldingsLlcMember   mcip:ClydesdaleHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 11,650    
Fair value at the ending $ 16,080   $ 11,650
Investment, Identifier [Axis]: Clydesdale Holdings, LLC, Revolver, Senior Loans, Due 6/23/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ClydesdaleHoldingsLlcMember   mcip:ClydesdaleHoldingsLlcMember
Investment, Identifier [Axis]: Clydesdale Holdings, LLC, Senior Loans, Due 6/23/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ClydesdaleHoldingsLlcMember   mcip:ClydesdaleHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,873    
Fair value at the ending $ 14,895   $ 14,873
Investment, Identifier [Axis]: Complete Innovations Inc., Senior Loans, One, Due 12/16/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CompleteInnovationsInc.Member   mcip:CompleteInnovationsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,080    
Fair value at the ending $ 8,148   $ 8,080
Investment, Identifier [Axis]: Complete Innovations Inc., Senior Loans, Two, Due 12/16/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CompleteInnovationsInc.Member   mcip:CompleteInnovationsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,025    
Fair value at the ending $ 1,033   $ 1,025
Investment, Identifier [Axis]: Crownpeak Technology Inc. (Revolver) Senior Secured Loans, Due 2/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CrownpeakTechnologyIncMember   mcip:CrownpeakTechnologyIncMember
Investment, Identifier [Axis]: Crownpeak Technology, Inc, Senior Secured Loans, Four, Due 2/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CrownpeakTechnologyIncMember   mcip:CrownpeakTechnologyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 833    
Fair value at the ending $ 833   $ 833
Investment, Identifier [Axis]: Crownpeak Technology, Inc, Senior Secured Loans, One, Due 2/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CrownpeakTechnologyIncMember   mcip:CrownpeakTechnologyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,000    
Fair value at the ending $ 1,000   $ 1,000
Investment, Identifier [Axis]: Crownpeak Technology, Inc, Senior Secured Loans, Three, Due 2/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CrownpeakTechnologyIncMember   mcip:CrownpeakTechnologyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 318    
Fair value at the ending $ 318   $ 318
Investment, Identifier [Axis]: Crownpeak Technology, Inc, Senior Secured Loans, Two, Due 2/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:CrownpeakTechnologyIncMember   mcip:CrownpeakTechnologyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15    
Fair value at the ending $ 15   $ 15
Investment, Identifier [Axis]: DataOnline Corp., Revolver, Senior Loans, Two, Due 11/13/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DataonlineCorp.Member   mcip:DataonlineCorp.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 815    
Fair value at the ending $ 824   $ 815
Investment, Identifier [Axis]: DataOnline Corp., Senior Loans, One, Due 11/13/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DataonlineCorp.Member   mcip:DataonlineCorp.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 6,084    
Fair value at the ending $ 6,138   $ 6,084
Investment, Identifier [Axis]: Denali Midco 2, LLC, Delayed Draw, Senior Loans, Due 12/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DenaliMidco2LlcMember   mcip:DenaliMidco2LlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,496    
Fair value at the ending $ 5,340   $ 2,496
Investment, Identifier [Axis]: Denali Midco 2, LLC, Senior Loans, Due 12/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DenaliMidco2LlcMember   mcip:DenaliMidco2LlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,450    
Fair value at the ending $ 12,469   $ 12,450
Investment, Identifier [Axis]: Dorado Acquisition, Inc, Equity Securities, Class A-2 units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionIncMember   mcip:DoradoAcquisitionInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 629    
Fair value at the ending $ 843   $ 629
Number of units held     531,783
Number of shares held 531,783    
Investment, Identifier [Axis]: Dorado Acquisition, Inc, Senior Secured Loans, One, Due 6/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionInc.Member   mcip:DoradoAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 13,797    
Fair value at the ending $ 13,500   $ 13,797
Investment, Identifier [Axis]: Dorado Acquisition, Inc, Senior Secured Loans, Two, Due 6/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionInc.Member   mcip:DoradoAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 11,406    
Fair value at the ending $ 11,189   $ 11,406
Investment, Identifier [Axis]: Dorado Acquisition, Inc. (Delayed Draw), Senior Secured Loans, Due 6/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionInc.Member   mcip:DoradoAcquisitionIncMember
Investment, Identifier [Axis]: Dorado Acquisition, Inc. (Revolver), Senior Secured Loans, Due 6/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionInc.Member   mcip:DoradoAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,670    
Fair value at the ending     $ 1,670
Investment, Identifier [Axis]: Dorado Acquisition, Inc., Equity Securities, Class A-1 units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DoradoAcquisitionIncMember   mcip:DoradoAcquisitionInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 601    
Fair value at the ending $ 601   $ 601
Number of units held     531,783
Number of shares held 531,783    
Investment, Identifier [Axis]: Drawbridge Partners, LLC (Delayed Draw), Senior Secured Loans, due 9/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DrawbridgePartnersLlcMember   mcip:DrawbridgePartnersLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 509    
Fair value at the ending $ 965   $ 509
Investment, Identifier [Axis]: Drawbridge Partners, LLC (Revolver), Senior Secured Loans, due 9/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DrawbridgePartnersLlcMember   mcip:DrawbridgePartnersLlcMember
Investment, Identifier [Axis]: Drawbridge Partners, LLC, Equity Securities, Class A-1 units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DrawbridgePartnersLlcMember   mcip:DrawbridgePartnersLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 629    
Fair value at the ending $ 649   $ 629
Number of units held 652,174   652,174
Investment, Identifier [Axis]: Drawbridge Partners, LLC, Senior Secured Loans, due 9/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:DrawbridgePartnersLlcMember   mcip:DrawbridgePartnersLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,854    
Fair value at the ending $ 14,897   $ 14,854
Investment, Identifier [Axis]: EOS Finco S.A.R.L., Senior Loans, Due 8/20/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EosFincoS.a.r.l.Member   mcip:EosFincoS.a.r.l.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,220    
Fair value at the ending $ 1,236   $ 1,220
Investment, Identifier [Axis]: Edustaff, LLC (Revolver), Senior Secured Loans, Due 12/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EdustaffLlcMember   mcip:EdustaffLlcMember
Investment, Identifier [Axis]: Edustaff, LLC, Equity Securites, Common stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EdustaffLlcMember   mcip:EdustaffLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 591    
Fair value at the ending $ 596   $ 591
Number of units held 591   591
Investment, Identifier [Axis]: Edustaff, LLC, Senior Secured Loans, Due 12/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EdustaffLlcMember   mcip:EdustaffLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,643    
Fair value at the ending $ 13,032   $ 12,643
Investment, Identifier [Axis]: Equine Network, LLC (Revolver), Senior Secured Loans, Due 12/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EquineNetworkLLCMember   mcip:EquineNetworkLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 109    
Fair value at the ending $ 108   $ 109
Investment, Identifier [Axis]: Equine Network, LLC, Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EquineNetworkLLCMember   mcip:EquineNetworkLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 93    
Fair value at the ending $ 85   $ 93
Number of units held     92
Number of shares held 92    
Investment, Identifier [Axis]: Equine Network, LLC, Senior Secured Loans, One, Due 12/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EquineNetworkLLCMember   mcip:EquineNetworkLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,465    
Fair value at the ending $ 1,452   $ 1,465
Investment, Identifier [Axis]: Equine Network, LLC, Senior Secured Loans, Three, Due 12/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EquineNetworkLLCMember   mcip:EquineNetworkLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 658    
Investment, Identifier [Axis]: Equine Network, LLC, Senior Secured Loans, Two, Due 12/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EquineNetworkLLCMember   mcip:EquineNetworkLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 664    
Fair value at the ending $ 181   $ 664
Investment, Identifier [Axis]: Evolve Biologics Inc., Delayed Draw, Unitranche Loans, Due 12/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EvolveBiologicsInc.Member   mcip:EvolveBiologicsInc.Member
Investment, Identifier [Axis]: Evolve Biologics Inc., Equity Securities, Equity commitments      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EvolveBiologicsInc.Member   mcip:EvolveBiologicsInc.Member
Investment, Identifier [Axis]: Evolve Biologics Inc., Equity Securities, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EvolveBiologicsInc.Member   mcip:EvolveBiologicsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 191    
Warrants to purchase percentage of equity 1.50%    
Investment, Identifier [Axis]: Evolve Biologics Inc., Unitranche Loans, Due 12/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EvolveBiologicsInc.Member   mcip:EvolveBiologicsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 16,925    
Fair value at the ending $ 17,532   $ 16,925
Investment, Identifier [Axis]: Exiger LLC (Delayed Draw), Senior Secured Loans, Due 9/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExigerLlcMember   mcip:ExigerLlcMember
Investment, Identifier [Axis]: Exiger LLC (Revolver), Senior Secured Loans, Due 9/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExigerLlcMember   mcip:ExigerLlcMember
Investment, Identifier [Axis]: Exiger LLC, Senior Secured Loans, One, Due 9/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExigerLlcMember   mcip:ExigerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,162    
Fair value at the ending $ 14,169   $ 14,162
Investment, Identifier [Axis]: Exiger LLC, Senior Secured Loans, Three, Due 9/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExigerLlcMember   mcip:ExigerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,235    
Fair value at the ending $ 4,237   $ 4,235
Investment, Identifier [Axis]: Exiger LLC, Senior Secured Loans, Two, Due 9/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExigerLlcMember   mcip:ExigerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,977    
Fair value at the ending $ 1,978   $ 1,977
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Equity Securites, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExpressWashAcquisitionCompanyLLCMember   mcip:ExpressWashAcquisitionCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 132    
Fair value at the ending $ 117   $ 132
Number of units held 135,869   135,869
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver, Senior Loans, Due 7/14/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExpressWashAcquisitionCompanyLlcMember   mcip:ExpressWashAcquisitionCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 293    
Fair value at the ending $ 289   $ 293
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Senior Loans, One, Due 7/14/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExpressWashAcquisitionCompanyLlcMember   mcip:ExpressWashAcquisitionCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 11,471    
Fair value at the ending $ 11,284   $ 11,471
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Senior Loans, Two, Due 7/14/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ExpressWashAcquisitionCompanyLlcMember   mcip:ExpressWashAcquisitionCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,149    
Fair value at the ending $ 2,114   $ 2,149
Investment, Identifier [Axis]: Fiasco Enterprises, LLC, Revolver, Senior Loans, Due 5/6/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FiascoEnterprisesLlcMember   mcip:FiascoEnterprisesLlcMember
Investment, Identifier [Axis]: Fiasco Enterprises, LLC, Senior Loans, One, Due 5/6/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FiascoEnterprisesLlcMember   mcip:FiascoEnterprisesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 6,965    
Fair value at the ending $ 6,941   $ 6,965
Investment, Identifier [Axis]: Fiasco Enterprises, LLC, Senior Loans, Two, Due 5/6/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FiascoEnterprisesLlcMember   mcip:FiascoEnterprisesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,404    
Fair value at the ending 8,400   $ 8,404
Investment, Identifier [Axis]: Florida East Coast Industries, L L C, Junior Secured Loans, due 6/28/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:FloridaEastCoastIndustriesLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 3,925    
Fair value at the ending     $ 3,925
Investment, Identifier [Axis]: Florida East Coast Industries, L L C, Senior Secured Loans, due 6/28/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:FloridaEastCoastIndustriesLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,362    
Fair value at the ending     $ 1,362
Investment, Identifier [Axis]: Florida East Coast Industries, LLC, Junior Secured Loans, Due 6/28/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:FloridaEastCoastIndustriesLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,983    
Investment, Identifier [Axis]: Fueled Digital Media, LLC (Delayed Draw), Senior Secured Loans, Due 11/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FueledDigitalMediaLlcMember   mcip:FueledDigitalMediaLlcMember
Investment, Identifier [Axis]: Fueled Digital Media, LLC (Revolver), Senior Secured Loans, Due 11/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   us-gaap-supplement:InvestmentAffiliatedIssuerControlledMember
Investment, Issuer Name [Extensible Enumeration] mcip:FueledDigitalMediaLlcMember   mcip:FueledDigitalMediaLlcMember
Investment, Identifier [Axis]: Fueled Digital Media, LLC, Senior Secured Loans, Due 11/1/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FueledDigitalMediaLlcMember   mcip:FueledDigitalMediaLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,609    
Fair value at the ending $ 5,782   $ 5,609
Investment, Identifier [Axis]: FusionSite MidCo LLC (Delayed Draw), Senior Secured Loans, Due 10/4/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FusionsiteMidcoLlcMember   mcip:FusionsiteMidcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,524    
Fair value at the ending $ 2,571   $ 2,524
Investment, Identifier [Axis]: FusionSite MidCo LLC (Revolver), Senior Secured Loans, Due 10/4/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FusionsiteMidcoLlcMember   mcip:FusionsiteMidcoLlcMember
Investment, Identifier [Axis]: FusionSite MidCo LLC, Senior Secured Loans, Due 10/4/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:FusionsiteMidcoLlcMember   mcip:FusionsiteMidcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,777    
Fair value at the ending $ 16,066   $ 15,777
Investment, Identifier [Axis]: GC Champion Acquisition LLC, Senior Secured Loans, One, Due 8/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:GCChampionAcquisitionLLCMember   mcip:GCChampionAcquisitionLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,838    
Fair value at the ending $ 12,870   $ 12,838
Investment, Identifier [Axis]: GC Champion Acquisition LLC, Senior Secured Loans, Two, Due 8/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:GCChampionAcquisitionLLCMember   mcip:GCChampionAcquisitionLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,593    
Investment, Identifier [Axis]: Golden State Buyer, Inc, Senior Secured Loans, Due 6/21/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:GoldenStateBuyerIncMember   mcip:GoldenStateBuyerIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,525    
Fair value at the ending $ 9,648   $ 9,525
Investment, Identifier [Axis]: HS4 Acquisitionco, Inc, Senior Secured Loans, One, Due 7/9/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:HS4AcquisitioncoIncMember   mcip:HS4AcquisitioncoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,922    
Fair value at the ending $ 3,910   $ 3,922
Investment, Identifier [Axis]: HS4 Acquisitionco, Inc, Senior Secured Loans, Two, Due 7/9/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:HS4AcquisitioncoIncMember   mcip:HS4AcquisitioncoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,261    
Fair value at the ending $ 4,248   $ 4,261
Investment, Identifier [Axis]: HS4 Acquisitionco, Inc. (Revolver), Senior Secured Loans, Due 7/9/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:HS4AcquisitioncoIncMember   mcip:HS4AcquisitioncoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 162    
Fair value at the ending $ 185   $ 162
Investment, Identifier [Axis]: IDIG Parent, LLC, Equity Securites, Common stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IDIGParentLLCMember   mcip:IDIGParentLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 254    
Fair value at the ending $ 235   $ 254
Number of units held 192,908   192,908
Investment, Identifier [Axis]: IF & P Holdings Company, LLC, Equity Securities, Class A preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IfAndPHoldingsCompanyLlcMember   mcip:IfPHoldingsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,500    
Fair value at the ending $ 1,572   $ 1,500
Number of units held 1,500   1,500
Investment, Identifier [Axis]: IF & P Holdings Company, LLC, Revolver, Senior Loans, Due 10/3/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IfAndPHoldingsCompanyLlcMember   mcip:IfAndPHoldingsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,092    
Fair value at the ending $ 1,456   $ 1,092
Investment, Identifier [Axis]: IF & P Holdings Company, LLC, Senior Loans, Due 10/3/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IfAndPHoldingsCompanyLlcMember   mcip:IfAndPHoldingsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 23,270    
Fair value at the ending $ 23,867   $ 23,270
Investment, Identifier [Axis]: IF & P Holdings Company, LLC, equity Securities, Class B common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IfAndPHoldingsCompanyLlcMember   mcip:IfPHoldingsCompanyLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 116    
Number of units held 1,500   1,500
Investment, Identifier [Axis]: INH Buyer, Inc, Senior Secured Loans, Due 6/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:INHBuyerInc.Member   mcip:INHBuyerInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,720    
Fair value at the ending 4,742   $ 4,720
Investment, Identifier [Axis]: Independence Buyer, Inc, Senior Secured Loans, Due 8/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:IndependenceBuyerInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,220    
Fair value at the ending     $ 12,220
Investment, Identifier [Axis]: Independence Buyer, Inc, Senior Secured Loans, due 8/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:IndependenceBuyerInc.Member    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 11,429    
Investment, Identifier [Axis]: Independence Buyer, Inc. ( Revolver), Senior Secured Loans, due 8/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:IndependenceBuyerInc.Member    
Investment, Identifier [Axis]: Independence Buyer, Inc. (Revolver), Senior Secured Loans, Due 8/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:IndependenceBuyerInc.Member
Investment, Identifier [Axis]: Independence Buyer, Inc., Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IndependenceBuyerInc.Member   mcip:IndependenceBuyerInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 212    
Fair value at the ending $ 195   $ 212
Number of units held     169
Number of shares held 169    
Investment, Identifier [Axis]: InsideRE, LLC (Revolver), Senior Secured Loans, Due 12/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:InsidereLlcMember   mcip:InsidereLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 64    
Fair value at the ending $ 64   $ 64
Investment, Identifier [Axis]: InsideRE, LLC, Equity Securities, Class A common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:InsidereLlcMember   mcip:InsidereLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 346    
Fair value at the ending $ 658   $ 346
Number of units held     159,884
Number of shares held 284,853    
Investment, Identifier [Axis]: InsideRE, LLC, Senior Secured Loans, One, Due 12/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:InsidereLlcMember   mcip:InsidereLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,305    
Fair value at the ending $ 7,483   $ 7,305
Investment, Identifier [Axis]: InsideRE, LLC, Senior Secured Loans, Two, Due 12/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:InsidereLlcMember   mcip:InsidereLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,907    
Investment, Identifier [Axis]: Inversiones DP6 (BVI) Numero Dos, Ltd., Delayed Draw, Unitranche Loans, Due 10/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:InversionesDp6BviNumeroDosLtd.Member   mcip:InversionesDp6BviNumeroDosLtd.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,817    
Fair value at the ending $ 16,107   $ 15,817
Investment, Identifier [Axis]: J2 BWA Funding III, LLC (Delayed Draw), Senior Secured Loans, Due 4/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] J2 BWA Funding III, LLC [Member]   mcip:J2BWAFundingLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,345    
Fair value at the ending     $ 1,345
Investment, Identifier [Axis]: J2 BWA Funding III, LLC, Equity Securities, Equity Commitment, One      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:J2BWAFundingLLCMember   J2 BWA Funding III, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 76    
Fair value at the ending     $ 76
Investment, Identifier [Axis]: J2 BWA Funding III, LLC, Equity Securities, Equity Commitment, Two      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:J2BWAFundingLLCMember   J2 BWA Funding III, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 181    
Investment, Identifier [Axis]: J2 BWA Funding LLC (Revolver), Senior Secured Loans, Due 12/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:J2BWAFundingLLCMember   mcip:J2BWAFundingLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,439    
Investment, Identifier [Axis]: J2 BWA Funding LLC, Equity Securities, Profit Sharing      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:J2BWAFundingLLCMember   mcip:J2BWAFundingLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 23    
Investment, Identifier [Axis]: Jumpstart Holdco, Inc., Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:JumpstartHoldcoInc.Member   mcip:JumpstartHoldcoInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 773    
Fair value at the ending $ 775   $ 773
Number of units held     1,566,667
Number of shares held 1,566,667    
Investment, Identifier [Axis]: Jumpstart Holdco, Inc., Unitranche Loans, Due 4/19/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:JumpstartHoldcoInc.Member   mcip:JumpstartHoldcoInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 21,857    
Fair value at the ending $ 21,610   $ 21,857
Investment, Identifier [Axis]: KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC) (Delayed Draw), Senior Secured Loans, Due 2/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:KlMoonAcquisitionLlcMember    
Investment, Identifier [Axis]: KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC) (Revolver), Senior Secured Loans, Due 2/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:KlMoonAcquisitionLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 263    
Investment, Identifier [Axis]: KL Moon Acquisition, LLC (fka Spectrum Science Communications, LLC) Senior Secured Loans, Due 2/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:KlMoonAcquisitionLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 9,700    
Investment, Identifier [Axis]: KL Moon Acquisition, LLC, Equity Securities      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:KlMoonAcquisitionLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 981    
Percentage of equity interest 0.30%    
Investment, Identifier [Axis]: Kenco PPC Buyer LLC, Delayed Draw, Senior Loans, Due 11/15/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KencoPpcBuyerLlcMember   mcip:KencoPpcBuyerLlcMember
Investment, Identifier [Axis]: Kenco PPC Buyer LLC, Revolver, Senior Loans, Due 11/15/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KencoPpcBuyerLlcMember   mcip:KencoPpcBuyerLlcMember
Investment, Identifier [Axis]: Kenco PPC Buyer LLC, Senior Loans, Due 11/15/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KencoPpcBuyerLlcMember   mcip:KencoPpcBuyerLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 21,393    
Fair value at the ending $ 21,821   $ 21,393
Investment, Identifier [Axis]: Kingsley Gate Partners, LLC (Delayed Draw), Senior Secure Loans, One, Due 12/11/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KingsleyGatePartnersLlcMember   mcip:KingsleyGatePartnersLlcMember
Investment, Identifier [Axis]: Kingsley Gate Partners, LLC (Delayed Draw), Senior Secure Loans, Two, Due 12/11/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KingsleyGatePartnersLlcMember   mcip:KingsleyGatePartnersLlcMember
Investment, Identifier [Axis]: Kingsley Gate Partners, LLC (Revolver), Senior Secure Loans, Due 12/11/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KingsleyGatePartnersLlcMember   mcip:KingsleyGatePartnersLlcMember
Investment, Identifier [Axis]: Kingsley Gate Partners, LLC, Senior Secure Loans, Due 12/11/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:KingsleyGatePartnersLlcMember   mcip:KingsleyGatePartnersLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,940    
Fair value at the ending $ 3,003   $ 2,940
Investment, Identifier [Axis]: L V F Holdings, Inc. ( Revolver), Senior Secured Loans, due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LVFHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 312    
Investment, Identifier [Axis]: L V F Holdings, Inc., Senior Secured Loans, ( Delayed Draw) due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LVFHoldingsIncMember    
Investment, Identifier [Axis]: L V F Holdings, Inc., Senior Secured Loans, One, due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LVFHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,348    
Investment, Identifier [Axis]: L V F Holdings, Inc., Senior Secured Loans, Two, due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LVFHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,205    
Investment, Identifier [Axis]: L X/ J T Intermediate Holdings, Inc. ( Revolver), Senior Secured Loans, due 3/11/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LXJTIntermediateHoldingsIncMember    
Investment, Identifier [Axis]: L X/ J T Intermediate Holdings, Inc., Senior Secured Loans, due 3/11/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LXJTIntermediateHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,231    
Investment, Identifier [Axis]: LVF Holdings, Inc, Senior Secured Loans, One, Due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LVFHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 3,353    
Fair value at the ending     $ 3,353
Investment, Identifier [Axis]: LVF Holdings, Inc, Senior Secured Loans, Two, Due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LVFHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 3,208    
Fair value at the ending     $ 3,208
Investment, Identifier [Axis]: LVF Holdings, Inc. (Delayed Draw), Senior Secured Loans, Due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LVFHoldingsIncMember
Investment, Identifier [Axis]: LVF Holdings, Inc. (Revolver), Senior Secured Loans, Due 6/10/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LVFHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 355    
Fair value at the ending     $ 355
Investment, Identifier [Axis]: LX/JT Intermediate Holdings, Inc, Senior Secured Loans, Due 3/11/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LXJTIntermediateHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,237    
Fair value at the ending     $ 3,237
Investment, Identifier [Axis]: LX/JT Intermediate Holdings, Inc. (Revolver), Senior Secured Loans, Due 3/11/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LXJTIntermediateHoldingsIncMember
Investment, Identifier [Axis]: Lessen Inc, Senior Secured Loans, Due 1/5/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LessenIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 7,680    
Investment, Identifier [Axis]: Lessen Inc., Equity Securities      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LessenIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,667    
Number of units held 128,737    
Investment, Identifier [Axis]: Lifted Trucks Holdings LLL, (Delayed Draw), Senior Secured Loans, Due 8/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LiftedTrucksHoldingsLLCMember
Investment, Identifier [Axis]: Lifted Trucks Holdings, LLC (Revolver), Senior Secured Loans, Due 8/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LiftedTrucksHoldingsLLCMember
Investment, Identifier [Axis]: Lifted Trucks Holdings, LLC, Equity Securities, Class A shares      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:LiftedTrucksHoldingsLLCMember   mcip:LiftedTrucksHoldingsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 111    
Fair value at the ending $ 127   $ 111
Number of shares held 158,730   158,730
Investment, Identifier [Axis]: Lifted Trucks Holdings, LLC, Senior Secured Loans, Due 8/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:LiftedTrucksHoldingsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,771    
Fair value at the ending     $ 9,771
Investment, Identifier [Axis]: Lifted Trucks Holdings, LLC. Senior Secured Loans, One, Due 8/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LiftedTrucksHoldingsLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 9,806    
Investment, Identifier [Axis]: Lifted Trucks Holdings, LLC. Senior Secured Loans, Two, Due 8/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:LiftedTrucksHoldingsLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 314    
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, , Junior Secured Loans, Due 9/30/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,032    
Fair value at the ending $ 2,954   $ 3,032
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Delayed Draw, Senior Loans, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,295    
Fair value at the ending $ 3,283   $ 3,295
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Revolver, Senior Loans, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 187    
Fair value at the ending $ 186   $ 187
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Senior Loans, Four, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,379    
Fair value at the ending $ 3,367   $ 3,379
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Senior Loans, One, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,027    
Fair value at the ending $ 2,020   $ 2,027
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Senior Loans, Three, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,354    
Fair value at the ending $ 1,350   $ 1,354
Investment, Identifier [Axis]: Light Wave Dental Management, LLC, Senior Loans, Two, Due 1/2/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Light Wave Dental Management, LLC [Member]   Light Wave Dental Management, LLC [Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,468    
Fair value at the ending $ 1,463   $ 1,468
Investment, Identifier [Axis]: Liquid Tech Solutions Holdings, LLC, Senior Secured Loans, due 3/17/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:LiquidTechSolutionsHoldingsLlcMember   mcip:LiquidTechSolutionsHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,147    
Fair value at the ending $ 2,170   $ 2,147
Investment, Identifier [Axis]: M C P Shaw Acquisitionco, L L C ( Revolver), Senior Secured Loans, due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MCPShawAcquisitioncoLLCMember    
Investment, Identifier [Axis]: M C P Shaw Acquisitionco, L L C, Senior Secured Loans, One, due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MCPShawAcquisitioncoLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 7,753    
Investment, Identifier [Axis]: M C P Shaw Acquisitionco, L L C, Senior Secured Loans, Two, due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MCPShawAcquisitioncoLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,371    
Investment, Identifier [Axis]: M V Receivables I I, L L C ( Delayed Draw), Senior Secured Loans, due 7/29/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MVReceivablesIILLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,960    
Fair value at the ending     $ 9,960
Investment, Identifier [Axis]: MCP Shaw Acquisitionco, LLC (Revolver), Senior Secured Loans, Due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MCPShawAcquisitioncoLLCMember
Investment, Identifier [Axis]: MCP Shaw Acquisitionco, LLC, Equity Securities, Class A-2 units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MCPShawAcquisitioncoLLCMember   mcip:MCPShawAcquisitioncoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 163    
Fair value at the ending $ 268   $ 163
Number of units held     95,125
Number of shares held 95,125    
Investment, Identifier [Axis]: MCP Shaw Acquisitionco, LLC, Senior Secured Loans, One, Due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MCPShawAcquisitioncoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,789    
Fair value at the ending     $ 7,789
Investment, Identifier [Axis]: MCP Shaw Acquisitionco, LLC, Senior Secured Loans, Three, due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MCPShawAcquisitioncoLLCMember   mcip:MCPShawAcquisitioncoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 783    
Fair value at the ending 780   $ 783
Investment, Identifier [Axis]: MCP Shaw Acquisitionco, LLC, Senior Secured Loans, Two, Due 11/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MCPShawAcquisitioncoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,381    
Fair value at the ending     $ 2,381
Investment, Identifier [Axis]: MPH Acquisition Holdings LLC, Senior Secured Loans, Due 9/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MphAcquisitionHoldingsLlcMember   mcip:MphAcquisitionHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,052    
Fair value at the ending $ 3,046   $ 3,052
Investment, Identifier [Axis]: MV Receivables II, LLC, Equity Securities, Common stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MVReceivablesIILLCMember   mcip:MVReceivablesIILLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,443    
Fair value at the ending $ 1,049   $ 1,443
Number of shares held 1,822   1,822
Investment, Identifier [Axis]: MV Receivables II, LLC, Equity Securities, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MVReceivablesIILLCMember   mcip:MVReceivablesIILLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,069    
Fair value at the ending $ 1,504   $ 2,069
Warrants to purchase percentage of equity 1.00%   1.00%
Investment, Identifier [Axis]: MV Receivables II, LLC, Senior Secured Loans, due 7/29/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MVReceivablesIILLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 9,742    
Investment, Identifier [Axis]: Madison Logic Holdings, Inc, Senior Secured Loans, Due 12/29/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MadisonLogicHoldingsIncMember   mcip:MadisonLogicHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 13,580    
Fair value at the ending $ 14,000   $ 13,580
Investment, Identifier [Axis]: Madison Logic Holdings, Inc. (Revolver), Senior Secured Loans, Due 12/29/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MadisonLogicHoldingsIncMember    
Investment, Identifier [Axis]: Madison Logic Holdings, Inc. (Revolver), Senior Secured Loans, Due 12/30/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MadisonLogicHoldingsIncMember
Investment, Identifier [Axis]: Mark Logic Corporation ( Revolver), Senior Secured Loans, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Investment, Identifier [Axis]: Mark Logic Corporation, Senior Secured Loans, Four, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 320    
Fair value at the ending     $ 320
Investment, Identifier [Axis]: Mark Logic Corporation, Senior Secured Loans, One, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 3,985    
Fair value at the ending     $ 3,985
Investment, Identifier [Axis]: Mark Logic Corporation, Senior Secured Loans, Three, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 478    
Fair value at the ending     $ 478
Investment, Identifier [Axis]: Mark Logic Corporation, Senior Secured Loans, Two, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 5,121    
Fair value at the ending     $ 5,121
Investment, Identifier [Axis]: MarkLogic Corporation, Equity Securities, Class A Units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MarkLogicCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 640    
Fair value at the ending     $ 640
Number of units held     435,358
Investment, Identifier [Axis]: Matrix Parent, Inc, Senior Secured Loans, Due 3/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MatrixParentIncMember   mcip:MatrixParentIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,057    
Fair value at the ending $ 1,982   $ 2,057
Investment, Identifier [Axis]: Medallia, Inc, Senior Secured Loans, due 10/27/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MedalliaIncMember   mcip:MedalliaIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 11,225    
Fair value at the ending $ 11,360   $ 11,225
Investment, Identifier [Axis]: Mindbody, Inc, Senior Secured Loans, One, Due 2/14/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MindbodyIncMember   mcip:MindbodyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,865    
Fair value at the ending $ 1,864   $ 1,865
Investment, Identifier [Axis]: Mindbody, Inc, Senior Secured Loans, Two, Due 2/14/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MindbodyIncMember   mcip:MindbodyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,375    
Fair value at the ending $ 7,372   $ 7,375
Investment, Identifier [Axis]: Mindbody, Inc. (Revolver), Senior Secured Loans, Due 2/14/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MindbodyIncMember   mcip:MindbodyIncMember
Investment, Identifier [Axis]: Money Lion, Inc. ( Delayed Draw), Junior Secured Loans, due 3/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MoneyLionIncMember
Investment, Identifier [Axis]: Money Lion, Inc., Junior Secured Loans, due 3/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MoneyLionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 18,445    
Fair value at the ending     $ 18,445
Investment, Identifier [Axis]: Money Lion, Inc., Junior Secured Loans, due 5/1/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:MoneyLionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,497    
Fair value at the ending     $ 2,497
Investment, Identifier [Axis]: MoneyLion, Inc., Delayed Draw, Junior Secured Loans, Due 3/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Name [Extensible Enumeration] mcip:MoneyLionIncMember    
Investment, Identifier [Axis]: MoneyLion, Inc., Junior Secured Loans, Due 3/24/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MoneyLionIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 18,680    
Investment, Identifier [Axis]: MoneyLion, Inc., Junior Secured Loans, Due 5/1/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:MoneyLionIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,500    
Investment, Identifier [Axis]: Moonraker Acquisitionco LLC (Delayed Draw), Senior Secured Loans, One, Due 8/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MoonrakerAcquisitioncoLlcMember   mcip:MoonrakerAcquisitioncoLlcMember
Investment, Identifier [Axis]: Moonraker Acquisitionco LLC (Delayed Draw), Senior Secured Loans, Two, Due 8/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MoonrakerAcquisitioncoLlcMember   mcip:MoonrakerAcquisitioncoLlcMember
Investment, Identifier [Axis]: Moonraker Acquisitionco LLC (Revolver), Senior Secured Loans, Due 8/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MoonrakerAcquisitioncoLlcMember   mcip:MoonrakerAcquisitioncoLlcMember
Investment, Identifier [Axis]: Moonraker Acquisitionco LLC, Senior Secured Loans, Due 8/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:MoonrakerAcquisitioncoLlcMember   mcip:MoonrakerAcquisitioncoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,000    
Fair value at the ending $ 6,983   $ 7,000
Investment, Identifier [Axis]: NCBP Property, LLC, Senior Secured Loans, Due 6/16/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NCBPPropertyLLCMember   mcip:NCBPPropertyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,507    
Fair value at the ending $ 2,511   $ 2,507
Investment, Identifier [Axis]: NQ PE Project Colosseum Midco Inc, Equity Securities, Common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NqPeProjectColosseumMidcoIncMember   mcip:NqPeProjectColosseumMidcoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,365    
Fair value at the ending $ 1,451   $ 1,365
Number of units held     1,364,614
Number of shares held 1,364,614    
Investment, Identifier [Axis]: NQ PE Project Colosseum Midco Inc, Senior Secured Loans, Due 10/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NqPeProjectColosseumMidcoInc.Member   mcip:NqPeProjectColosseumMidcoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,308    
Fair value at the ending $ 14,660   $ 14,308
Investment, Identifier [Axis]: NQ PE Project Colosseum Midco Inc. (Delayed Draw), Senior Secured Loans, Due 10/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NqPeProjectColosseumMidcoInc.Member   mcip:NqPeProjectColosseumMidcoIncMember
Investment, Identifier [Axis]: NQ PE Project Colosseum Midco Inc. (Revolver), Senior Secured Loans, Due 10/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NqPeProjectColosseumMidcoInc.Member   mcip:NqPeProjectColosseumMidcoIncMember
Investment, Identifier [Axis]: NTM Acquisition Corp, Senior Secured Loans, Due 6/7/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NtmAcquisitionCorpMember   mcip:NtmAcquisitionCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,270    
Fair value at the ending $ 4,168   $ 4,270
Investment, Identifier [Axis]: Nastel Technologies, LLC      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,500    
Discount accretion 4    
Net unrealized gain (loss) (4)    
Fair value at the ending $ 3,500   3,500
Investment, Identifier [Axis]: Nastel Technologies, LLC (3,408 Class A units)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,578    
Net unrealized gain (loss) 537    
Fair value at the ending $ 4,115   $ 3,578
Number of units held 3,408    
Investment, Identifier [Axis]: Nastel Technologies, LLC (Revolver)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC    
Investment, Identifier [Axis]: Nastel Technologies, LLC (Revolver), Senior Secured Loans, Two, Due 9/21/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC   Nastel Technologies, LLC
Investment, Identifier [Axis]: Nastel Technologies, LLC, Equity Securities      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC   Nastel Technologies, LLC
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,578    
Fair value at the ending $ 4,115   $ 3,578
Number of units held 3,408   3,408
Investment, Identifier [Axis]: Nastel Technologies, LLC, Senior Secured Loans, One, Due 9/21/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Nastel Technologies, LLC   Nastel Technologies, LLC
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,500    
Fair value at the ending $ 3,500   $ 3,500
Investment, Identifier [Axis]: NationsBenefits, LLC (Delayed Draw), Senior Secured Loans, Due 8/26/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,943    
Fair value at the ending $ 8,350   $ 2,943
Investment, Identifier [Axis]: NationsBenefits, LLC (Revolver), Senior Secured Loans, Due 8/26/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,722    
Fair value at the ending $ 2,722   $ 2,722
Investment, Identifier [Axis]: NationsBenefits, LLC, Equity Securities, Common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 201    
Fair value at the ending $ 177   $ 201
Number of units held     326,667
Number of shares held 326,667    
Investment, Identifier [Axis]: NationsBenefits, LLC, Equity Securities, Series B units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,861    
Fair value at the ending $ 2,824   $ 2,861
Number of shares held 356,658    
Investment, Identifier [Axis]: NationsBenefits, LLC, Senior Secured Loans, One, Due 8/26/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,370    
Fair value at the ending $ 12,339   $ 12,370
Investment, Identifier [Axis]: NationsBenefits, LLC, Senior Secured Loans, Two, Due 8/26/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NationsBenefitsLLCMember   mcip:NationsBenefitsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 14,741    
Fair value at the ending $ 14,704   $ 14,741
Investment, Identifier [Axis]: New Engen, Inc., , Unitranche Loans, Two, Due 12/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NewEngenInc.Member   mcip:NewEngenInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,877    
Fair value at the ending $ 7,870   $ 7,877
Investment, Identifier [Axis]: New Engen, Inc., Equity Securites, Class B common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NewEngenInc.Member   mcip:NewEngenInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5    
Fair value at the ending     $ 5
Number of units held 5,067    
Number of shares held     5,067
Investment, Identifier [Axis]: New Engen, Inc., Equity Securites, Preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NewEngenInc.Member   mcip:NewEngenInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 391    
Fair value at the ending $ 388   $ 391
Number of units held 417   417
Investment, Identifier [Axis]: New Engen, Inc., Unitranche Loans, One, Due 12/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NewEngenInc.Member   mcip:NewEngenInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,327    
Fair value at the ending $ 9,319   $ 9,327
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc, Senior Secured Loans, Four, due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,575    
Fair value at the ending $ 2,554   $ 2,575
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc, Senior Secured Loans, One, Due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,448    
Fair value at the ending $ 2,427   $ 2,448
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc, Senior Secured Loans, Three, due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,433    
Fair value at the ending $ 1,420   $ 1,433
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc, Senior Secured Loans, Two, Due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 709    
Fair value at the ending $ 703   $ 709
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc. (Delayed Draw), Senior Secured Loans, Due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Investment, Identifier [Axis]: North Haven USHC Acquisition, Inc. (Revolver), Senior Secured Loans, Due 10/30/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:NorthHavenUSHCAcquisitionIncMember   mcip:NorthHavenUSHCAcquisitionIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 187    
Fair value at the ending $ 187   $ 187
Investment, Identifier [Axis]: OIS Management Services, LLC (Delayed Draw), Senior Secured Loans, Due 11/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OisManagementServicesLlcMember   mcip:OisManagementServicesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 451    
Investment, Identifier [Axis]: OIS Management Services, LLC (Revolver), Senior Secured Loans, Due 11/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OisManagementServicesLlcMember   mcip:OisManagementServicesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 77    
Investment, Identifier [Axis]: OIS Management Services, LLC, Senior Secured Loans, Due 11/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OisManagementServicesLlcMember   mcip:OisManagementServicesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,750    
Fair value at the ending $ 10,013   $ 9,750
Investment, Identifier [Axis]: Oceana Australian Fixed Income Trust, Senior Secured Loans, Due 2/25/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OceanaAustralianFixedIncomeTrustMember   mcip:OceanaAustralianFixedIncomeTrustMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,321    
Fair value at the ending $ 7,184   $ 7,321
Investment, Identifier [Axis]: Oceana Australian Fixed Income Trust, Senior Secured Loans, Due 6/29/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OceanaAustralianFixedIncomeTrustMember   mcip:OceanaAustralianFixedIncomeTrustMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,084    
Fair value at the ending $ 3,026   $ 3,084
Investment, Identifier [Axis]: Onit, Inc., Unitranche Loans, Due 5/2/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OnitInc.Member   mcip:OnitInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 16,632    
Fair value at the ending $ 16,758   $ 16,632
Investment, Identifier [Axis]: Optomi, LLC (Revolver), Senior Secured Loans, Due 12/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OptomiLlcMember   mcip:OptomiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,030    
Fair value at the ending $ 1,036   $ 1,030
Investment, Identifier [Axis]: Optomi, LLC, Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OptomiLlcMember   mcip:OptomiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 512    
Fair value at the ending $ 554   $ 512
Number of units held 278   278
Investment, Identifier [Axis]: Optomi, LLC, Senior Secured Loans, One, Due 12/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OptomiLlcMember   mcip:OptomiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,668    
Fair value at the ending $ 5,527   $ 5,668
Investment, Identifier [Axis]: Optomi, LLC, Senior Secured Loans, Two, Due 12/16/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:OptomiLlcMember   mcip:OptomiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,980    
Fair value at the ending $ 13,031   $ 12,980
Investment, Identifier [Axis]: Oranje Holdco, Inc, Senior Secured Loans, Due 2/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:OranjeHoldcoIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 13,650    
Investment, Identifier [Axis]: Oranje Holdco, Inc. (Revolver), Senior Secured Loans, Due 2/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:OranjeHoldcoIncMember    
Investment, Identifier [Axis]: Pacific Bells, LLC, Senior Loans, Due 11/10/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PacificBellsLlcMember   mcip:PacificBellsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,770    
Fair value at the ending $ 2,824   $ 2,770
Investment, Identifier [Axis]: Panda Acquisition, LLC, Senior Secured Loans, due 10/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PandaAcquisitionLlcMember   mcip:PandaAcquisitionLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,200    
Fair value at the ending 8,198   $ 8,200
Investment, Identifier [Axis]: Par Petroleum, LLC, Senior Secured Loans, Due 1/12/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ParPetroleumLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 844    
Fair value at the ending     $ 844
Investment, Identifier [Axis]: Patagonia Holdco LLC, Senior Loans, Due 8/1/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PatagoniaHoldcoLlcMember   mcip:PatagoniaHoldcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 12,026    
Fair value at the ending $ 12,440   $ 12,026
Investment, Identifier [Axis]: Polychem Acquisition, L L C, Senior Secured Loans, due 3/17/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:PolychemAcquisitionLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,920    
Investment, Identifier [Axis]: Polychem Acquisition, LLC, Senior Secured Loans, Due 3/17/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:PolychemAcquisitionLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 1,925    
Fair value at the ending     $ 1,925
Investment, Identifier [Axis]: Premier Roofing L.L.C, Senior Secured Loans, Due 8/29/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:PremierRoofingLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,392    
Fair value at the ending     $ 3,392
Investment, Identifier [Axis]: Premier Roofing L.L.C. (Revolver), Senior Secured Loans, due 8/29/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PremierRoofingLlcMember   mcip:PremierRoofingLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 948    
Fair value at the ending $ 952   $ 948
Investment, Identifier [Axis]: Premier Roofing L.L.C., Senior Secured Loans, due 8/29/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:PremierRoofingLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,398    
Investment, Identifier [Axis]: Prototek LLC (Delayed Draw), Senior Secured Loans, Due 12/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PrototekLlcMember   mcip:PrototekLlcMember
Investment, Identifier [Axis]: Prototek LLC (Revolver), Senior Secured Loans, Due 12/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PrototekLlcMember   mcip:PrototekLlcMember
Investment, Identifier [Axis]: Prototek LLC, Senior Secured Loans, Due 12/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:PrototekLlcMember   mcip:PrototekLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,760    
Fair value at the ending 7,984   $ 7,760
Investment, Identifier [Axis]: QF Holdings, Inc, Senior Secured Loans, (Delayed Draw), Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:QfHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 692    
Fair value at the ending     $ 692
Investment, Identifier [Axis]: QF Holdings, Inc, Senior Secured Loans, Four, Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:QfHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 910    
Investment, Identifier [Axis]: QF Holdings, Inc, Senior Secured Loans, One, Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QfHoldingsIncMember   mcip:QfHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,555    
Fair value at the ending $ 4,550   $ 4,555
Investment, Identifier [Axis]: QF Holdings, Inc, Senior Secured Loans, Three, Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QfHoldingsIncMember   mcip:QfHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 911    
Fair value at the ending $ 910   $ 911
Investment, Identifier [Axis]: QF Holdings, Inc, Senior Secured Loans, Two, Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QfHoldingsIncMember   mcip:QfHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,372    
Fair value at the ending $ 4,368   $ 4,372
Investment, Identifier [Axis]: QF Holdings, Inc. (Revolver), Senior Secured Loans, Due 12/15/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QfHoldingsIncMember   mcip:QfHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 182    
Investment, Identifier [Axis]: QuarterNorth Energy Inc., Equity Securities, Common stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QuarternorthEnergyIncMember   mcip:QuarternorthEnergyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 606    
Fair value at the ending $ 608   $ 606
Number of shares held 4,376   4,376
Investment, Identifier [Axis]: Quest Resource Management Group LLC Senior Secured Loans Four Due 10 20 2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember   mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 381    
Fair value at the ending $ 370   $ 381
Investment, Identifier [Axis]: Quest Resource Management Group, L L C, Senior Secured Loans, One, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 944    
Investment, Identifier [Axis]: Quest Resource Management Group, L L C, Senior Secured Loans, Three, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,673    
Investment, Identifier [Axis]: Quest Resource Management Group, L L C, Senior Secured Loans, Two, due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1,036    
Investment, Identifier [Axis]: Quest Resource Management Group, LLC, Equity Securities, One, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember   mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 210    
Fair value at the ending $ 210   $ 210
Warrants to purchase percentage of equity 0.20%   0.20%
Investment, Identifier [Axis]: Quest Resource Management Group, LLC, Equity Securities, Two, Warrants      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:QuestResourceManagementGroupLLCMember   mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 147    
Fair value at the ending $ 147   $ 147
Warrants to purchase percentage of equity 0.20%   0.20%
Investment, Identifier [Axis]: Quest Resource Management Group, LLC, Senior Secured Loans, One, Due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 972    
Fair value at the ending     $ 972
Investment, Identifier [Axis]: Quest Resource Management Group, LLC, Senior Secured Loans, Three, Due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 3,781    
Fair value at the ending     $ 3,781
Investment, Identifier [Axis]: Quest Resource Management Group, LLC, Senior Secured Loans, Two, Due 10/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:QuestResourceManagementGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,067    
Fair value at the ending     $ 1,067
Investment, Identifier [Axis]: RS Acquisition, LLC, Delayed Draw, Senior Loans, Due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RsAcquisitionLlcMember   mcip:RsAcquisitionLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,087    
Fair value at the ending $ 8,100   $ 8,087
Investment, Identifier [Axis]: RS Acquisition, LLC, Equity Securites, Common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RsAcquisitionLlcMember   mcip:RsAcquisitionLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,053    
Fair value at the ending $ 1,162   $ 1,053
Number of units held 753,485   753,485
Investment, Identifier [Axis]: RS Acquisition, LLC, Revolver, Senior Loans, Due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RsAcquisitionLlcMember   mcip:RsAcquisitionLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 887    
Fair value at the ending $ 1,237   $ 887
Investment, Identifier [Axis]: RS Acquisition, LLC, Senior Loans, Due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RsAcquisitionLlcMember   mcip:RsAcquisitionLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 10,634    
Fair value at the ending $ 10,650   $ 10,634
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw, Senior Loans, Due 11/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RandysHoldingsInc.Member   mcip:RandysHoldingsInc.Member
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver, Senior Loans, Due 11/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RandysHoldingsInc.Member   mcip:RandysHoldingsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 347    
Fair value at the ending $ 427   $ 347
Investment, Identifier [Axis]: Randys Holdings, Inc., Senior Loans, Due 11/1/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RandysHoldingsInc.Member   mcip:RandysHoldingsInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 16,534    
Fair value at the ending $ 16,926   $ 16,534
Investment, Identifier [Axis]: Really Great Reading Company, Inc, Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ReallyGreatReadingCompanyIncMember   mcip:ReallyGreatReadingCompanyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 11,700    
Fair value at the ending $ 12,060   $ 11,700
Investment, Identifier [Axis]: Really Great Reading Company, Inc. (Delayed Draw), Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ReallyGreatReadingCompanyIncMember   mcip:ReallyGreatReadingCompanyIncMember
Investment, Identifier [Axis]: Really Great Reading Company, Inc. (Revolver), Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ReallyGreatReadingCompanyIncMember   mcip:ReallyGreatReadingCompanyIncMember
Investment, Identifier [Axis]: Really Great Reading Company, Inc., Equity Securites, Series A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ReallyGreatReadingCompanyIncMember   mcip:ReallyGreatReadingCompanyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 369    
Fair value at the ending $ 386   $ 369
Number of units held 369   369
Investment, Identifier [Axis]: Recorded Future, Inc., Equity Securities, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Recorded Future, Inc [ Member]   Recorded Future, Inc [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 113    
Fair value at the ending $ 126   $ 113
Number of units held 40,243   40,243
Investment, Identifier [Axis]: Recycled Plastics Industries, L L C ( Revolver), Senior Secured Loans, due 8/4/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:RecycledPlasticsIndustriesLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 288    
Investment, Identifier [Axis]: Recycled Plastics Industries, L L C, Senior Secured Loans, due 8/4/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:RecycledPlasticsIndustriesLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 5,255    
Investment, Identifier [Axis]: Recycled Plastics Industries, LLC (Revolver), Senior Secured Loans, Due 8/4/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:RecycledPlasticsIndustriesLLCMember
Investment, Identifier [Axis]: Recycled Plastics Industries, LLC, Senior Secured Loans, Due 8/4/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:RecycledPlasticsIndustriesLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,295    
Fair value at the ending     $ 5,295
Investment, Identifier [Axis]: Relativity ODA LLC (Revolver), Senior Secured Loans, Due 5/12/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelativityODALLCMember   mcip:RelativityODALLCMember
Investment, Identifier [Axis]: Relativity ODA LLC, Senior Secured Loans, Due 5/12/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelativityODALLCMember   mcip:RelativityODALLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,151    
Fair value at the ending 5,213   $ 5,151
Investment, Identifier [Axis]: Relevate Health Group, L L C ( Delayed Draw), Senior Secured Loans, due, 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:RelevateHealthGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 865    
Fair value at the ending     $ 865
Investment, Identifier [Axis]: Relevate Health Group, L L C, Equity Securities, Class B common units      
Transactions with Affiliated Companies, Fair value Roll Forward      
Number of units held     0.1
Investment, Identifier [Axis]: Relevate Health Group, LLC (Revolver), Senior Secured Loans, Due 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember   mcip:RelevateHealthGroupLLCMember
Investment, Identifier [Axis]: Relevate Health Group, LLC, Equity Securites, Class B common units)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember   mcip:RelevateHealthGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Number of units held 96   96
Investment, Identifier [Axis]: Relevate Health Group, LLC, Equity Securites, Preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember   mcip:RelevateHealthGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 86    
Fair value at the ending $ 77   $ 86
Number of units held 96   96
Investment, Identifier [Axis]: Relevate Health Group, LLC, Senior Secured Loans, One, Due 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember   mcip:RelevateHealthGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,933    
Fair value at the ending $ 1,935   $ 1,933
Investment, Identifier [Axis]: Relevate Health Group, LLC, Senior Secured Loans, Three, Due 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 865    
Investment, Identifier [Axis]: Relevate Health Group, LLC, Senior Secured Loans, Two, Due 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:RelevateHealthGroupLLCMember   mcip:RelevateHealthGroupLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,150    
Fair value at the ending $ 5,156   $ 5,150
Investment, Identifier [Axis]: Renaissance Learning, Inc, Senior Secured Loans, Due 4/5/2030      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:RenaissanceLearningIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 7,275    
Investment, Identifier [Axis]: Research Now Group, Inc. and Survey Sampling International, LLC, Senior Secured Loans, Due 12/20/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ResearchNowGroupInc.andSurveySamplingInternationalLLCMember   mcip:ResearchNowGroupInc.andSurveySamplingInternationalLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,888    
Fair value at the ending $ 1,907   $ 1,888
Investment, Identifier [Axis]: S&S Holdings LLC, Senior Loans, Due 3/10/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SSHoldingsLlcMember   mcip:SAndSHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,695    
Fair value at the ending $ 2,780   $ 2,695
Investment, Identifier [Axis]: SCP Eye Care Holdco, LLC (Delayed Draw), Senior Secured Loans, Due 10/5/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ScpEyeCareHoldcoLlcMember   mcip:ScpEyeCareHoldcoLlcMember
Investment, Identifier [Axis]: SCP Eye Care Holdco, LLC (Revolver), Senior Secured Loans, Due 10/5/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ScpEyeCareHoldcoLlcMember   mcip:ScpEyeCareHoldcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 117    
Fair value at the ending $ 513   $ 117
Investment, Identifier [Axis]: SCP Eye Care Holdco, LLC, Senior Secured Loans, Due 10/5/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ScpEyeCareHoldcoLlcMember   mcip:ScpEyeCareHoldcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,977    
Fair value at the ending $ 8,862   $ 8,977
Investment, Identifier [Axis]: SCP Intermediate Holdings, LLC, Senior Secured Loans, Due 12/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ScpIntermediateHoldingsLlcMember   mcip:ScpIntermediateHoldingsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,925    
Fair value at the ending $ 2,968   $ 2,925
Investment, Identifier [Axis]: SFR Holdco, LLC (10.5% of equity commitments), (LLC interest)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]   Non-controlled affiliate company investments Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,545    
Purchases (cost) 841 $ 131  
Fair value at the ending $ 2,386 $ 131 $ 1,545
Warrants to purchase percentage of equity 10.50% 10.50%  
Investment, Identifier [Axis]: SFR Holdco, LLC (13.9% of equity commitments), (LLC interest)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]   Non-controlled affiliate company investments Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,900 $ 3,900 $ 3,900
Fair value at the ending $ 3,900 $ 3,900 $ 3,900
Warrants to purchase percentage of equity 13.90% 13.90%  
Investment, Identifier [Axis]: SFR Holdco, LLC (Delayed Draw), Junior Secured Loans, Due 7/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member]   S F R Holdco, L L C [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,316    
Fair value at the ending $ 3,577   $ 2,316
Investment, Identifier [Axis]: SFR Holdco, LLC (Delayed draw junior secured loan)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments  
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member]  
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,316    
Purchases (cost) 1,261 $ 196  
Fair value at the ending $ 3,577 $ 196 2,316
Investment, Identifier [Axis]: SFR Holdco, LLC, Equity Securities, Two, due 7/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member]    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,386    
Investment, Identifier [Axis]: SFR Holdco, LLC, Equity Securities, due 7/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member]    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,900    
Investment, Identifier [Axis]: SFR Holdco, LLC, Junior Secured Loan, One      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments  
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member] S F R Holdco, L L C [ Member]  
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,850 $ 5,850 5,850
Fair value at the ending $ 5,850 $ 5,850 $ 5,850
Investment, Identifier [Axis]: SFR Holdco, LLC, Junior Secured Loans, Due 7/28/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] S F R Holdco, L L C [ Member]   S F R Holdco, L L C [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,850    
Fair value at the ending 5,850   $ 5,850
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions) (Revolver), Senior Secured Loans, Due 7/25/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 71    
Fair value at the ending     $ 71
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions) (Revolver), Senior Secured Loans, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 131    
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions), Senior Secured Loans, Five, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 991    
Fair value at the ending $ 988   $ 991
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions), Senior Secured Loans, Four, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,015    
Fair value at the ending $ 1,012   $ 1,015
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions), Senior Secured Loans, One, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,918    
Fair value at the ending $ 1,913   $ 1,918
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions), Senior Secured Loans, Three, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,732    
Fair value at the ending $ 1,726   $ 1,732
Investment, Identifier [Axis]: SI Holdings, Inc. (Integrated Polymer Solutions), Senior Secured Loans, Two, Due 7/25/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SHIHoldingsIncMember   mcip:ApiHoldingsIiiCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,001    
Fair value at the ending $ 998   $ 1,001
Investment, Identifier [Axis]: SIP Care Services, LLC (Delayed Draw), Senior Secured Loans, Due 12/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SipCareServicesLlcMember   mcip:SipCareServicesLlcMember
Investment, Identifier [Axis]: SIP Care Services, LLC (Revolver), Senior Secured Loans, Due 12/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SipCareServicesLlcMember   mcip:SipCareServicesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 144    
Fair value at the ending $ 143   $ 144
Investment, Identifier [Axis]: SIP Care Services, LLC, Senior Secured Loans, Due 12/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SipCareServicesLlcMember   mcip:SipCareServicesLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,583    
Fair value at the ending $ 3,541   $ 3,583
Investment, Identifier [Axis]: Sabrosura Foods Llc Et Al Equity Securities Class AAA Units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 5    
Number of units held 8,322    
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al (Revolver), Senior Secured Loans, due 10/18/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember   mcip:SabrosuraFoodsLlcEtAlMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,009    
Fair value at the ending $ 1,272   $ 1,009
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al, Equity Securities, Class A interests      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember   mcip:SabrosuraFoodsLlcEtAlMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4    
Fair value at the ending     $ 4
Number of shares held 171,429   171,429
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al, Equity Securities, Class AA units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember   mcip:SabrosuraFoodsLlcEtAlMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7    
Fair value at the ending $ 4   $ 7
Number of units held     7,022
Number of shares held 7,022    
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al, Senior Secured Loans, One, Due 10/18/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:SabrosuraFoodsLlcEtAlMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,984    
Fair value at the ending     $ 4,984
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al, Senior Secured Loans, Two, due 10/18/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember   mcip:SabrosuraFoodsLlcEtAlMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 282    
Fair value at the ending $ 259   $ 282
Investment, Identifier [Axis]: Sabrosura Foods, LLC et al, Senior Secured Loans, due 10/18/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:SabrosuraFoodsLlcEtAlMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 4,576    
Investment, Identifier [Axis]: Sandvine Corporation, Senior Loans, Due 10/31/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SandvineCorporationMember   mcip:SandvineCorporationMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,104    
Fair value at the ending $ 1,100   $ 1,104
Investment, Identifier [Axis]: Second Avenue S F R Holdings I I L L C ( Revolver), Senior Secured Loans, Due 8/9/2024      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] Second Avenue S F R Holdings I I L L C [ Member]   Second Avenue S F R Holdings I I L L C [ Member]
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,755    
Fair value at the ending $ 4,743   $ 4,755
Investment, Identifier [Axis]: Second Avenue SFR Holdings II LLC (Revolver)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments  
Investment, Issuer Name [Extensible Enumeration] Second Avenue S F R Holdings I I L L C [ Member] Second Avenue S F R Holdings I I L L C [ Member]  
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,755 $ 2,104 2,104
Purchases (cost)   487  
Net unrealized gain (loss) (12)    
Fair value at the ending $ 4,743 $ 2,591 $ 4,755
Investment, Identifier [Axis]: Securly, Inc, Senior Secured Loans, One, Due 4/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SecurlyIncMember   mcip:SecurlyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,642    
Fair value at the ending $ 3,689   $ 3,642
Investment, Identifier [Axis]: Securly, Inc, Senior Secured Loans, Three, Due 4/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SecurlyIncMember   mcip:SecurlyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,907    
Fair value at the ending $ 1,931   $ 1,907
Investment, Identifier [Axis]: Securly, Inc, Senior Secured Loans, Two, Due 4/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SecurlyIncMember   mcip:SecurlyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,264    
Fair value at the ending $ 8,369   $ 8,264
Investment, Identifier [Axis]: Securly, Inc. (Delayed Draw), Senior Secured Loans, Due 4/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SecurlyIncMember   mcip:SecurlyIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,780    
Fair value at the ending $ 1,802   $ 1,780
Investment, Identifier [Axis]: Securly, Inc. (Revolver), Senior Secured Loans, Due 4/22/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SecurlyIncMember   mcip:SecurlyIncMember
Investment, Identifier [Axis]: Seran BioScience, LLC (Delayed Draw), Senior Secured Loans, Due 7/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SeranBioScienceLLCMember   mcip:SeranBioScienceLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,056    
Fair value at the ending $ 1,590   $ 1,056
Investment, Identifier [Axis]: Seran BioScience, LLC (Revolver), Senior Secured Loans, Due 7/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SeranBioScienceLLCMember   mcip:SeranBioScienceLLCMember
Investment, Identifier [Axis]: Seran BioScience, LLC, Equity Securities, Common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SeranBioScienceLLCMember   mcip:SeranBioScienceLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 429    
Fair value at the ending $ 471   $ 429
Number of units held     26,666
Number of shares held 26,666    
Investment, Identifier [Axis]: Seran BioScience, LLC, Senior Secured Loans, Due 7/8/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SeranBioScienceLLCMember   mcip:SeranBioScienceLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,948    
Fair value at the ending $ 1,953   $ 1,948
Investment, Identifier [Axis]: SheerTrans Solutions, LLC      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,101    
Sales and paydowns (cost) (13)    
Discount accretion 6    
Net unrealized gain (loss) (5)    
Fair value at the ending $ 5,089   5,101
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (8,642,579 preferred interests)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,643    
Net unrealized gain (loss) 86    
Fair value at the ending $ 8,729   $ 8,643
Number of shares held 8,642,579    
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Revolver)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember    
Investment, Identifier [Axis]: SheerTrans Solutions, LLC (Revolver), Senior Secured Loans, Two, Due 7/29/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember   mcip:SheertransSolutionsLlcMember
Investment, Identifier [Axis]: SheerTrans Solutions, LLC, Equity Securities      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember   mcip:SheertransSolutionsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,643    
Fair value at the ending $ 8,729   $ 8,643
Number of units held 8,642,579    
Number of shares held     8,642,579
Investment, Identifier [Axis]: SheerTrans Solutions, LLC, Senior Secured Loans, One, Due 7/29/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SheertransSolutionsLlcMember   mcip:SheertransSolutionsLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,101    
Fair value at the ending $ 5,089   $ 5,101
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc, Senior Secured Loans, Due 12/2/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SimplicityFinancialMarketingGroupHoldingsIncMember   mcip:SimplicityFinancialMarketingGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,641    
Fair value at the ending $ 9,617   $ 9,641
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc. (Delayed Draw), Senior Secured Loans, Due 12/2/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SimplicityFinancialMarketingGroupHoldingsIncMember   mcip:SimplicityFinancialMarketingGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 6,402    
Investment, Identifier [Axis]: Simplicity Financial Marketing Group Holdings Inc. (Revolver), Senior Secured Loans, Due 12/2/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SimplicityFinancialMarketingGroupHoldingsIncMember   mcip:SimplicityFinancialMarketingGroupHoldingsIncMember
Investment, Identifier [Axis]: Skillsoft Corp., Equity Securites, Class A shares      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SkillsoftCorp.Member   mcip:SkillsoftCorp.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 34    
Fair value at the ending $ 52   $ 34
Number of units held 26,168   26,168
Investment, Identifier [Axis]: Sound Inpatient Physicians, Inc, Senior Secured Loans, Due 6/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SoundInpatientPhysiciansIncMember   mcip:SoundInpatientPhysiciansIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,309    
Fair value at the ending 2,223   $ 2,309
Investment, Identifier [Axis]: Spectrum Science Communications, L L C ( Revolver), Senior Secured Loans, due 1/25/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:SpectrumScienceCommunicationsLLCMember
Investment, Identifier [Axis]: Spectrum Science Communications, L L C, Senior Secured Loans, due 1/25/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:SpectrumScienceCommunicationsLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,015    
Fair value at the ending     $ 3,015
Investment, Identifier [Axis]: Spherix Global Inc, Equity Securities, Class A units      
Transactions with Affiliated Companies, Fair value Roll Forward      
Number of units held     1.5
Investment, Identifier [Axis]: Spherix Global Inc, Senior Secured Loans, Due 12/22/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SpherixGlobalIncMember   mcip:SpherixGlobalIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,450    
Fair value at the ending $ 4,321   $ 4,450
Investment, Identifier [Axis]: Spherix Global Inc. (Revolver), Senior Secured Loans, Due 12/22/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SpherixGlobalIncMember   mcip:SpherixGlobalIncMember
Investment, Identifier [Axis]: Spherix Global Inc., Equity Securites, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SpherixGlobalInc.Member   mcip:SpherixGlobalInc.Member
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 256    
Fair value at the ending $ 189   $ 256
Number of units held 333   333
Investment, Identifier [Axis]: Sports Operating Holdings II, LLC (Delayed Draw), Senior Secured Loans, Due 11/3/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SportsOperatingHoldingsIiLlcMember   mcip:SportsOperatingHoldingsIiLlcMember
Investment, Identifier [Axis]: Sports Operating Holdings II, LLC (Revolver), Senior Secured Loans, Due 11/3/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SportsOperatingHoldingsIiLlcMember   mcip:SportsOperatingHoldingsIiLlcMember
Investment, Identifier [Axis]: Sports Operating Holdings II, LLC, Senior Secured Loans, Due 11/3/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SportsOperatingHoldingsIiLlcMember   mcip:SportsOperatingHoldingsIiLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,863    
Fair value at the ending $ 4,975   $ 4,863
Investment, Identifier [Axis]: Star Compliance Mid Co, L L C, ( Revolver), Senior Secured Loans, due 1/12/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StarComplianceMidCoLLCMember   mcip:StarComplianceMidCoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 119    
Fair value at the ending $ 138   $ 119
Investment, Identifier [Axis]: Star Compliance Mid Co, L L C, Senior Secured Loans, One, due 1/12/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StarComplianceMidCoLLCMember   mcip:StarComplianceMidCoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,951    
Fair value at the ending $ 2,955   $ 2,951
Investment, Identifier [Axis]: Star Compliance Mid Co, L L C, Senior Secured Loans, Two, due 1/12/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StarComplianceMidCoLLCMember   mcip:StarComplianceMidCoLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 495    
Fair value at the ending $ 496   $ 495
Investment, Identifier [Axis]: StormTrap, LLC, Delayed Draw, , Unitranche Loans, Due 3/24/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StormTrapLLCMember   mcip:StormTrapLLCMember
Investment, Identifier [Axis]: StormTrap, LLC, Equity Securities, Class A common units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StormTrapLLCMember   mcip:StormTrapLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 213    
Fair value at the ending $ 165   $ 213
Number of shares held 640,000   640,000
Investment, Identifier [Axis]: StormTrap, LLC, Equity Securities, Class A preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StormTrapLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 640    
Fair value at the ending $ 640   $ 640
Number of units held     640,000
Number of shares held 640,000    
Investment, Identifier [Axis]: StormTrap, LLC, Unitranche Loans, Due 3/24/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StormTrapLLCMember   mcip:StormTrapLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,516    
Fair value at the ending $ 7,497   $ 7,516
Investment, Identifier [Axis]: Streamland Media MidCo LLC, Senior Secured Loans, One, Due 8/31/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StreamlandMediaMidcoLlcMember   mcip:StreamlandMediaMidcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,974    
Fair value at the ending $ 1,969   $ 1,974
Investment, Identifier [Axis]: Streamland Media MidCo LLC, Senior Secured Loans, Two, Due 8/31/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:StreamlandMediaMidcoLlcMember   mcip:StreamlandMediaMidcoLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 535    
Fair value at the ending $ 533   $ 535
Investment, Identifier [Axis]: Sundance Group Holdings, Inc, Senior Secured Loans, One, Due 7/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SundanceGroupHoldingsIncMember   mcip:SundanceGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,131    
Fair value at the ending $ 4,121   $ 4,131
Investment, Identifier [Axis]: Sundance Group Holdings, Inc, Senior Secured Loans, Three, Due 7/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SundanceGroupHoldingsIncMember   mcip:SundanceGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,239    
Fair value at the ending $ 1,236   $ 1,239
Investment, Identifier [Axis]: Sundance Group Holdings, Inc, Senior Secured Loans, Two, Due 7/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SundanceGroupHoldingsIncMember   mcip:SundanceGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 165    
Fair value at the ending $ 165   $ 165
Investment, Identifier [Axis]: Sundance Group Holdings, Inc. (Revolver), Senior Secured Loans, Due 7/2/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:SundanceGroupHoldingsIncMember   mcip:SundanceGroupHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 49    
Investment, Identifier [Axis]: T C F I I I O W L Buyer L L C, Senior Secured Loans, One, due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TCFIIIOWLBuyerLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 4,421    
Investment, Identifier [Axis]: T C F I I I O W L Buyer L L C, Senior Secured Loans, Three, due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TCFIIIOWLBuyerLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 4,845    
Investment, Identifier [Axis]: T C F I I I O W L Buyer L L C, Senior Secured Loans, Two, due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TCFIIIOWLBuyerLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 5,399    
Investment, Identifier [Axis]: TCFIII Owl Buyer LLC, Senior Secured Loans, One, Due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TCFIIIOWLBuyerLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 4,438    
Fair value at the ending     $ 4,438
Investment, Identifier [Axis]: TCFIII Owl Buyer LLC, Senior Secured Loans, Three, Due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TCFIIIOWLBuyerLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 4,863    
Fair value at the ending     $ 4,863
Investment, Identifier [Axis]: TCFIII Owl Buyer LLC, Senior Secured Loans, Two, Due 4/17/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TCFIIIOWLBuyerLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,419    
Fair value at the ending     $ 5,419
Investment, Identifier [Axis]: TEAM Public Choices, LLC, Senior Secured Loans, Due 12/17/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TEAMPublicChoicesLLCMember   mcip:TEAMPublicChoicesLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,378    
Fair value at the ending $ 4,435   $ 4,378
Investment, Identifier [Axis]: The GEO Group, Inc, Senior Secured Loans, Due 3/23/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:GeoGroupIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,030    
Investment, Identifier [Axis]: The Kyjen Company, L L C ( Revolver), Senior Secured Loans, due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TheKyjenCompanyLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 264    
Investment, Identifier [Axis]: The Kyjen Company, L L C, Senior SEcured Loans, Two, Due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TheKyjenCompanyLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 1    
Investment, Identifier [Axis]: The Kyjen Company, L L C, Senior Secured Loans, due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:TheKyjenCompanyLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 2,916    
Investment, Identifier [Axis]: The Kyjen Company, LLC (Revolver), Senior Secured Loans, Due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TheKyjenCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 265    
Fair value at the ending     $ 265
Investment, Identifier [Axis]: The Kyjen Company, LLC, Senior Secured Loans, One, Due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TheKyjenCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 2,925    
Fair value at the ending     $ 2,925
Investment, Identifier [Axis]: The Kyjen Company, LLC, Senior Secured Loans, Two, Due 4/3/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:TheKyjenCompanyLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1    
Fair value at the ending     $ 1
Investment, Identifier [Axis]: Thrasio, L L C, Senior Secured Loans, due 12/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ThrasioLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 4,841    
Investment, Identifier [Axis]: Thrasio, LLC, Senior Secured Loans, Due 12/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ThrasioLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,890    
Fair value at the ending     $ 4,890
Investment, Identifier [Axis]: Thryv, Inc, Senior Secured Loans, Due 2/27/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ThryvIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 8,367    
Investment, Identifier [Axis]: Thryv, Inc, Senior Secured Loans, Due 3/1/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:ThryvIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,102    
Fair value at the ending     $ 9,102
Investment, Identifier [Axis]: TigerConnect, Inc, Senior Secured Loans, Due 2/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TigerConnectIncMember   mcip:TigerConnectIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,875    
Fair value at the ending $ 9,888   $ 9,875
Investment, Identifier [Axis]: TigerConnect, Inc. (Delayed Draw), Senior Secured Loans, Due 2/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TigerConnectIncMember   mcip:TigerConnectIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 91    
Fair value at the ending $ 184   $ 91
Investment, Identifier [Axis]: TigerConnect, Inc. (Revolver), Senior Secured Loans, Due 2/16/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TigerConnectIncMember   mcip:TigerConnectIncMember
Investment, Identifier [Axis]: Transact Holdings Inc, Senior Secured Loans, Due 4/30/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TransactHoldingsIncMember   mcip:TransactHoldingsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 687    
Fair value at the ending $ 712   $ 687
Investment, Identifier [Axis]: Trilon Group, LLC, Senior Secured Loans, One, Due 5/25/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TrilonGroupLlcMember   mcip:TrilonGroupLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 5,335    
Fair value at the ending $ 5,448   $ 5,335
Investment, Identifier [Axis]: Trilon Group, LLC, Senior Secured Loans, Two, Due 5/25/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:TrilonGroupLlcMember   mcip:TrilonGroupLlcMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 393    
Fair value at the ending $ 4,358   $ 393
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, Five, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 556    
Fair value at the ending $ 553   $ 556
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, Four, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 501    
Fair value at the ending $ 497   $ 501
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, One, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 128    
Fair value at the ending $ 127   $ 128
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, Six, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 714    
Fair value at the ending $ 709   $ 714
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, Three, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 627    
Fair value at the ending $ 623   $ 627
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Senior Secured Loans, Two, due 12/14/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:Truck-LiteCo.LLCMember   mcip:Truck-LiteCo.LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,379    
Fair value at the ending $ 3,355   $ 3,379
Investment, Identifier [Axis]: Unanet, Inc, Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:UnanetIncMember   mcip:UnanetIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 21,560    
Fair value at the ending $ 22,000   $ 21,560
Investment, Identifier [Axis]: Unanet, Inc. (Delayed Draw), Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:UnanetIncMember    
Investment, Identifier [Axis]: Unanet, Inc. (Revolver), Senior Secured Loans, Due 12/8/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:UnanetIncMember   mcip:UnanetIncMember
Investment, Identifier [Axis]: Unanet, Inc., Equity Securities, Common Stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:UnanetIncMember   mcip:UnanetIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,621    
Fair value at the ending $ 1,637   $ 1,621
Number of units held     1,621,053
Number of shares held 1,621,053    
Investment, Identifier [Axis]: VB E1, LLC, Unitranche Loans, Due 11/18/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:VBE1LLCMember   mcip:VBE1LLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 3,009    
Fair value at the ending $ 3,006   $ 3,009
Investment, Identifier [Axis]: Verdantas LLC (Delayed Draw), Senior Secured Loans, Due 7/1/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:VerdantasLlcMember    
Investment, Identifier [Axis]: Verdantas LLC, Senior Secured Loans, Due 7/1/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:VerdantasLlcMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 3,880    
Investment, Identifier [Axis]: Viad Corp, Senior Loans, Due 7/30/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ViadCorpMember   mcip:ViadCorpMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,718    
Fair value at the ending $ 4,751   $ 4,718
Investment, Identifier [Axis]: Vice Group Holding Inc, Senior Secured Loans, Four, Due 5/12/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ViceGroupHoldingIncMember   mcip:ViceGroupHoldingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 239    
Fair value at the ending $ 247   $ 239
Investment, Identifier [Axis]: Vice Group Holding Inc, Senior Secured Loans, One, Due 5/12/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ViceGroupHoldingIncMember   mcip:ViceGroupHoldingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,243    
Fair value at the ending $ 1,288   $ 1,243
Investment, Identifier [Axis]: Vice Group Holding Inc, Senior Secured Loans, Three, Due 5/12/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ViceGroupHoldingIncMember   mcip:ViceGroupHoldingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 147    
Fair value at the ending $ 152   $ 147
Investment, Identifier [Axis]: Vice Group Holding Inc, Senior Secured Loans, Two, Due 5/12/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:ViceGroupHoldingIncMember   mcip:ViceGroupHoldingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 390    
Fair value at the ending $ 403   $ 390
Investment, Identifier [Axis]: Vice Group Holding Inc. (Delayed Draw), Senior Secured Loans, Due 5/12/2023      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:ViceGroupHoldingIncMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 286    
Investment, Identifier [Axis]: Volt Bidco, Inc, Equity Securities, Common stock      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:VoltBidcoIncMember   mcip:VoltBidcoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 886    
Fair value at the ending $ 1,090   $ 886
Number of shares held 878   878
Investment, Identifier [Axis]: Volt Bidco, Inc, Senior Secured Loans, Due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:VoltBidcoIncMember   mcip:VoltBidcoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 9,048    
Fair value at the ending $ 9,059   $ 9,048
Investment, Identifier [Axis]: Volt Bidco, Inc. (Delayed Draw), Senior Secured Loans, Due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:VoltBidcoIncMember   mcip:VoltBidcoIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 868    
Fair value at the ending $ 1,164   $ 868
Investment, Identifier [Axis]: Volt Bidco, Inc. (Revolver), Senior Secured Loans, Due 8/11/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:VoltBidcoIncMember   mcip:VoltBidcoIncMember
Investment, Identifier [Axis]: W3 Monroe RE Debt LLC (Delayed Draw), Senior Secured Loans, Due 2/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:W3MonroeREDebtLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 13    
Investment, Identifier [Axis]: W3 Monroe RE Debt LLC, Senior Secured Loans, Due 2/4/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:W3MonroeREDebtLLCMember   mcip:W3MonroeREDebtLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,944    
Fair value at the ending $ 1,978   $ 1,944
Investment, Identifier [Axis]: Watchguard Technologies, Inc, Senior Secured Loans, Due 6/29/2029      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WatchguardTechnologiesIncMember   mcip:UnanetIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 20,225    
Fair value at the ending $ 20,180   $ 20,225
Investment, Identifier [Axis]: WebPT, Inc, Senior Secured Loans, Due 1/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WebptIncMember   mcip:WebptIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 4,980    
Fair value at the ending $ 4,973   $ 4,980
Investment, Identifier [Axis]: WebPT, Inc. (Revolver), Senior Secured Loans, Due 1/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WebptIncMember   mcip:WebptIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 201    
Fair value at the ending $ 342   $ 201
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc, Senior Secured Loans, Due 6/2/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WhistlerParentHoldingsIIIIncMember   mcip:WhistlerParentHoldingsIIIIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 20,801    
Fair value at the ending $ 20,769   $ 20,801
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Delayed Draw), Senior Secured Loans, Due 6/2/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WhistlerParentHoldingsIIIIncMember   mcip:WhistlerParentHoldingsIIIIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 260    
Fair value at the ending $ 260   $ 260
Investment, Identifier [Axis]: Whistler Parent Holdings III, Inc. (Revolver), Senior Secured Loans, Due 6/2/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WhistlerParentHoldingsIIIIncMember   mcip:WhistlerParentHoldingsIIIIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 390    
Fair value at the ending 389   $ 390
Investment, Identifier [Axis]: Witkoff/ Monroe 700 J V L L C ( Delayed Draw), Junior Secured Loans, due 7/2/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]     Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]     mcip:WitkoffMonroe700JVLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 8,404    
Fair value at the ending     $ 8,404
Investment, Identifier [Axis]: Witkoff/Monroe 700 JV LLC, Delayed Draw, Junior Secured Loans, Due 7/2/2026      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration] mcip:WitkoffMonroe700JVLLCMember    
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the ending $ 9,089    
Investment, Identifier [Axis]: Witkoff/Monroe 700 JV LLC, Equity Securities, Preferred units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:WitkoffMonroe700JVLLCMember   mcip:WitkoffMonroe700JVLLCMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,462    
Fair value at the ending $ 2,262   $ 1,462
Number of units held     2,992
Number of shares held 2,992    
Investment, Identifier [Axis]: Xan Edu Publishing, Inc, Equity Securities, Class A units      
Transactions with Affiliated Companies, Fair value Roll Forward      
Number of units held     356,658
Investment, Identifier [Axis]: XanEdu Publishing, Inc, Senior Secured Loans, One, Due 1/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:XanEduPublishingIncMember   mcip:XanEduPublishingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 6,056    
Fair value at the ending $ 6,037   $ 6,056
Investment, Identifier [Axis]: XanEdu Publishing, Inc, Senior Secured Loans, Two, Due 1/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:XanEduPublishingIncMember   mcip:XanEduPublishingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,406    
Fair value at the ending $ 2,399   $ 2,406
Investment, Identifier [Axis]: XanEdu Publishing, Inc. (Revolver), Senior Secured Loans, Due 1/28/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:XanEduPublishingIncMember   mcip:XanEduPublishingIncMember
Investment, Identifier [Axis]: XanEdu Publishing, Inc., Equity Securites, Class A units      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:XanEduPublishingIncMember   mcip:XanEduPublishingIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 294    
Fair value at the ending $ 314   $ 294
Number of units held 65,104   65,104
Investment, Identifier [Axis]: YS WH4 LLC (Revolver), Senior Secured Loans, Due 11/20/2025      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:W3MonroeREDebtLLCMember   mcip:YSWH4LLCRevolverMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 2,604    
Fair value at the ending $ 893   $ 2,604
Investment, Identifier [Axis]: ecMarket Inc. and Conexiom US Inc, Senior Secured Loans, One, Due 9/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EcmarketInc.AndConexiomUsIncMember   mcip:EcmarketInc.AndConexiomUsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 15,847    
Fair value at the ending $ 16,391   $ 15,847
Investment, Identifier [Axis]: ecMarket Inc. and Conexiom US Inc, Senior Secured Loans, Two, Due 9/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EcmarketInc.AndConexiomUsIncMember   mcip:EcmarketInc.AndConexiomUsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 1,276    
Fair value at the ending $ 1,280   $ 1,276
Investment, Identifier [Axis]: ecMarket Inc. and Conexiom US Inc. (Revolver), Senior Secured Loans, Due 9/21/2027      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EcmarketInc.AndConexiomUsIncMember   mcip:EcmarketInc.AndConexiomUsIncMember
Investment, Identifier [Axis]: ecMarket Inc. and Conexiom US Inc., Equity Securites, Preferred shares)      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:EcmarketInc.AndConexiomUsIncMember   mcip:EcmarketInc.AndConexiomUsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 698    
Fair value at the ending $ 728   $ 698
Number of units held 96,603   96,603
Investment, Identifier [Axis]: iCIMS, Inc, Senior Secured Loans, Due 8/18/2028      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration] mcip:IcimsIncMember   mcip:IcimsIncMember
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning $ 7,860    
Fair value at the ending 8,000   $ 7,860
Non-controlled affiliate company investments      
Investments in and Advances to Affiliates [Line Items]      
Investment, Issuer Affiliation [Extensible Enumeration]   Non-controlled affiliate company investments  
Transactions with Affiliated Companies, Fair value Roll Forward      
Fair value at the beginning 39,188 $ 11,854 11,854
Purchases (cost) 2,102 814  
Sales and paydowns (cost) (13)    
Discount accretion 10    
Net unrealized gain (loss) 602    
Fair value at the ending $ 41,889 $ 12,668 $ 39,188