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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Jan. 31, 2026
Jun. 30, 2025
Document And Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act File Number 001-35000    
Entity Registrant Name Walker & Dunlop, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 80-0629925    
Entity Address, Address Line One 7272 Wisconsin Avenue    
Entity Address, Address Line Two Suite 1300    
Entity Address, City or Town Bethesda    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 20814    
City Area Code 301    
Local Phone Number 215-5500    
Title of 12(b) Security Common Stock, $0.01 Par Value Per Share    
Trading Symbol WD    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1.7
Entity Common Stock, Shares Outstanding   34,060,397  
Documents Incorporated by Reference [Text Block]

Portions of the Proxy Statement of Walker & Dunlop, Inc. with respect to its 2026 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A of the Securities Exchange Act of 1934, as amended, on or prior to May 18, 2026 are incorporated by reference into Part III of this report.

    
Entity Central Index Key 0001497770    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location McLean, Virginia