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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Feb. 20, 2025
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Trading Symbol MKTX  
Entity Registrant Name MARKETAXESS HOLDINGS INC.  
Entity Central Index Key 0001278021  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Current Reporting Status Yes  
ICFR Auditor Attestation Flag true  
Document Financial Statement Error Correction [Flag] false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   37,693,220
Entity Public Float $ 6.5  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $0.003 par value  
Security Exchange Name NASDAQ  
Entity File Number 001-34091  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 52-2230784  
Entity Address, Address Line One 55 Hudson Yards  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
Document Annual Report true  
Document Transition Report false  
City Area Code 212  
Local Phone Number 813-6000  
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for the 2025 Annual Meeting of Stockholders are incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this Form 10-K.

  
Auditor Name PricewaterhouseCoopers LLP  
Auditor Location New York, New York  
Auditor Firm ID 238  
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial condition of MarketAxess Holdings Inc. and its subsidiaries (the “Company”) as of December 31, 2024 and 2023, and the related consolidated statements of operations, of comprehensive income, of changes in stockholders’ equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.