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Management Fees, Incentive Fees and Other Expenses - Additional Information (Details) - USD ($)					12 Months Ended	83 Months Ended
	Feb. 24, 2025	Mar. 18, 2024	Mar. 17, 2024	Feb. 08, 2019	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Percentage of management fee on assets						200.00%
Percentage of management fee on net asset value						1.50%
Base management fee rate				150.00%
Percentage of net asset value				200.00%
Mangement fee waving description	On February 24, 2025, the Advisor voluntarily agreed to waive one third of its management fee for each of the first three quarters of 2025, starting on January 1, 2025 and ending on September 30, 2025. On January 22, 2026, the Advisor approved a one-time waiver to waive one third of its management fee for the fourth quarter of 2025.
Advisor waived					$ (7,300,000)
Cumulative total return					7.00%
Accrued reserve for additional incentive compensation					$ 0	$ 0	$ 0
Maximum
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Percentage of management fee on net asset value						1.50%
Percentage of reduction of incentive compensation on net investment income and net unrealized losses						20.00%
Percentage of reduction of cumulative return hurdle						8.00%
Percentage rate of net realized gains on income fee reduction				20.00%
Minimum
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Percentage of management fee on net asset value						1.00%
Percentage of reduction of incentive compensation on net investment income and net unrealized losses						17.50%
Percentage of reduction of cumulative return hurdle						7.00%
Percentage rate of net realized gains on income fee reduction				17.50%
BlackRock Capital Investment Corporation
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Base management fee rate		100.00%	150.00%	100.00%
Percentage of net asset value		200.00%	200.00%
BlackRock Capital Investment Corporation | Maximum
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Base management fee rate		150.00%		150.00%
Price per share		$ 0.32		$ 0.32
BlackRock Capital Investment Corporation | Minimum
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Base management fee rate		125.00%		125.00%
Percentage of net asset value		200.00%		200.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-7

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