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Cover Page
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Cover [Abstract]  
Document Type 10-K/A
Amendment Flag true
Document Period End Date Dec. 31, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Registrant Name NexPoint Capital, Inc.
Entity Central Index Key 0001588272
Entity File Number 814-01074
Entity Tax Identification Number 38-3926499
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Document Annual Report true
Document Transition Report false
Entity Incorporation, State or Country Code DE
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding | shares 8,359,344
Entity Address, Address Line One 300 Crescent Court, Suite 700
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75201
City Area Code 972
Local Phone Number 628-4100
Title of 12(g) Security Common Stock, par value $0.001 per share
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Public Float | $ $ 0
Auditor Name Cohen & Company, LTD
Auditor Firm ID 925
Auditor Location Cleveland, Ohio, United States
Document Financial Statement Error Correction [Flag] false
ICFR Auditor Attestation Flag false
Amendment Description EXPLANATORY NOTE NexPoint Capital, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “Original 10-K”), which was originally filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2026 (“Original Filing Date”), solely to correct the name of a member of the Company’s Board of Directors in the director signature block of the Original 10-K. Except as described above, no changes have been made to the Original 10-K and this Amendment does not modify, amend or update in any way any of the financial or other information contained in the Original 10-K. This Amendment does not reflect events that may have occurred subsequent to the Original Filing Date. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto as Exhibits 31.1, and 31.2. Because no financial statements have been included in this Amendment, paragraphs 3, 4, and 5 of the certifications have been omitted. Section 906 certifications are attached hereto as Exhibit 32.1.