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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 27, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Registrant Name BLACKROCK TCP CAPITAL CORP.    
Entity Central Index Key 0001370755    
Entity Public Float     $ 654.8
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   84,331,037  
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity File Number 814-00899    
Entity Tax Identification Number 56-2594706    
Entity Address, Address Line One 2951 28th Street    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Santa Monica    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90405    
City Area Code 310    
Local Phone Number 566-1000    
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code DE    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol TCPC    
Security Exchange Name NASDAQ    
Document Financial Statement Error Correction [Flag] false    
Document Incorporated by Reference Portions of the Registrant’s Proxy Statement relating to the Registrant’s 2026 Annual Meeting of Shareholders to be filed not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference into Part III of this Report.    
Auditor Name Deloitte & Touche LLP    
Auditor Location Los Angeles, California    
Auditor Firm ID 34    
ICFR Auditor Attestation Flag true    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated statements of assets and liabilities of BlackRock TCP Capital Corp. and subsidiaries
(the “Company”), including the consolidated schedules of investments, as of December 31, 2025 and 2024, the related consolidated
statements of operations, changes in net assets, and cash flows for each of the three years in the period then ended, financial highlights
(in Note 10) for each of the five years in the period then ended, and the related notes and schedules and statements listed in Index Item
15(a) (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material
respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations, changes in net
assets, and cash flows for each of the three years in the period then ended, and the financial highlights for each of the five years in the
period then ended, in conformity with accounting principles generally accepted in the United States of America.


We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States)
(PCAOB), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal
Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our
report dated February 26, 2026, expressed an unqualified opinion on the Company's internal control over financial reporting.