INVESTMENTS - Fair Value Level 3 (Details)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 1,324,527,000	$ 1,349,121,000
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	959,740,000	985,158,000
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	100,924,000	106,894,000
Equity shares
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	199,513,000	192,641,000
Equity warrants
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	1,158,000	1,043,000
Structured products
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	27,745,000	26,173,000
Royalty rights
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	1,936,000
Level 3
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	1,237,052,000	1,254,451,000
Level 3 \| Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	918,020,000	949,079,000
Level 3 \| Senior debt and 1st lien notes \| Yield Analysis \| Market Yield
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 820,623,000	$ 844,635,000
Level 3 \| Senior debt and 1st lien notes \| Yield Analysis \| Market Yield \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.081	0.078
Level 3 \| Senior debt and 1st lien notes \| Yield Analysis \| Market Yield \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.195	0.196
Level 3 \| Senior debt and 1st lien notes \| Yield Analysis \| Market Yield \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.112	0.112
Level 3 \| Senior debt and 1st lien notes \| Market Approach \| Adjusted EBITDA Multiple
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 16,122,000	$ 7,247,000
Level 3 \| Senior debt and 1st lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	6.5	1.1
Level 3 \| Senior debt and 1st lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	11.5	12.5
Level 3 \| Senior debt and 1st lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	8.4	3.5
Level 3 \| Senior debt and 1st lien notes \| Recent Transaction \| Transaction Price
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 71,538,000	$ 84,483,000
Level 3 \| Senior debt and 1st lien notes \| Recent Transaction \| Transaction Price \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.950	0.970
Level 3 \| Senior debt and 1st lien notes \| Recent Transaction \| Transaction Price \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.995	1.000
Level 3 \| Senior debt and 1st lien notes \| Recent Transaction \| Transaction Price \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.983	0.979
Level 3 \| Senior debt and 1st lien notes \| Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 9,737,000	$ 12,714,000
Level 3 \| Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	100,924,000	96,851,000
Level 3 \| Subordinated debt and 2nd lien notes \| Yield Analysis \| Market Yield
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 80,659,000	$ 85,803,000
Level 3 \| Subordinated debt and 2nd lien notes \| Yield Analysis \| Market Yield \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.085	0.085
Level 3 \| Subordinated debt and 2nd lien notes \| Yield Analysis \| Market Yield \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.180	0.189
Level 3 \| Subordinated debt and 2nd lien notes \| Yield Analysis \| Market Yield \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.131	0.131
Level 3 \| Subordinated debt and 2nd lien notes \| Market Approach \| Adjusted EBITDA Multiple
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 13,487,000	$ 4,986,000
Measurement input		11.0
Level 3 \| Subordinated debt and 2nd lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	9.0
Level 3 \| Subordinated debt and 2nd lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	23.2
Level 3 \| Subordinated debt and 2nd lien notes \| Market Approach \| Adjusted EBITDA Multiple \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	15.9	11.0
Level 3 \| Subordinated debt and 2nd lien notes \| Recent Transaction \| Transaction Price
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 709,000	$ 670,000
Measurement input	0.980	0.980
Level 3 \| Subordinated debt and 2nd lien notes \| Recent Transaction \| Transaction Price \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.980	0.980
Level 3 \| Subordinated debt and 2nd lien notes \| Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 6,069,000	$ 5,392,000
Level 3 \| Equity shares
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	199,125,000	192,563,000
Level 3 \| Equity shares \| Yield Analysis \| Market Yield
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 19,434,000	$ 8,788,000
Measurement input		0.146
Level 3 \| Equity shares \| Yield Analysis \| Market Yield \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.097
Level 3 \| Equity shares \| Yield Analysis \| Market Yield \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	0.257
Level 3 \| Equity shares \| Yield Analysis \| Market Yield \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.143	0.146
Level 3 \| Equity shares \| Market Approach \| Adjusted EBITDA Multiple
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 160,680,000	$ 162,996,000
Level 3 \| Equity shares \| Market Approach \| Adjusted EBITDA Multiple \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	5.5	4.8
Level 3 \| Equity shares \| Market Approach \| Adjusted EBITDA Multiple \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	27.0	30.0
Level 3 \| Equity shares \| Market Approach \| Adjusted EBITDA Multiple \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	16.0	11.2
Level 3 \| Equity shares \| Market Approach \| Revenue Multiple
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 1,225,000	$ 1,390,000
Level 3 \| Equity shares \| Market Approach \| Revenue Multiple \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	5.5	6.5
Level 3 \| Equity shares \| Market Approach \| Revenue Multiple \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	9.0	9.5
Level 3 \| Equity shares \| Market Approach \| Revenue Multiple \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	6.1	6.8
Level 3 \| Equity shares \| Discounted Cash Flow Analysis \| Discount Rate
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 8,043,000	$ 6,080,000
Measurement input	0.144	0.142
Level 3 \| Equity shares \| Discounted Cash Flow Analysis \| Discount Rate \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	0.144	0.142
Level 3 \| Equity shares \| Recent Transaction \| Transaction Price
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 277,000	$ 5,203,000
Measurement input	100.00
Level 3 \| Equity shares \| Recent Transaction \| Transaction Price \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input		1.00
Level 3 \| Equity shares \| Recent Transaction \| Transaction Price \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input		10.00
Level 3 \| Equity shares \| Recent Transaction \| Transaction Price \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	100.00	9.64
Level 3 \| Equity shares \| Net Asset Approach \| Liabilities
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 2,357,000	$ 2,131,000
Measurement input	76,365,900	55,281,800
Level 3 \| Equity shares \| Net Asset Approach \| Liabilities \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	76,365,900	55,281,800
Level 3 \| Equity shares \| Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 7,109,000	$ 5,975,000
Level 3 \| Equity warrants
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	1,158,000	1,043,000
Level 3 \| Equity warrants \| Market Approach
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 1,158,000	$ 1,043,000
Level 3 \| Equity warrants \| Market Approach \| Adjusted EBITDA Multiple \| Minimum
Schedule of Equity Method Investments [Line Items]
Measurement input	6.3	6.3
Level 3 \| Equity warrants \| Market Approach \| Adjusted EBITDA Multiple \| Maximum
Schedule of Equity Method Investments [Line Items]
Measurement input	11.5	12.5
Level 3 \| Equity warrants \| Market Approach \| Adjusted EBITDA Multiple \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	7.9	7.5
Level 3 \| Structured products
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 15,889,000	$ 14,915,000
Level 3 \| Structured products \| Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	15,889,000	$ 14,915,000
Level 3 \| Royalty rights
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	1,936,000
Level 3 \| Royalty rights \| Recent Transaction \| Transaction Price
Schedule of Equity Method Investments [Line Items]
Total investments at fair value	$ 1,936,000
Measurement input	1.00
Level 3 \| Royalty rights \| Recent Transaction \| Transaction Price \| Weighted Average
Schedule of Equity Method Investments [Line Items]
Measurement input	1.00

Barings Capital Investment Corp 10-Q