v3.26.1
Document and Entity Information Document - shares
 3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Entity File Number 001-34963  
Entity Registrant Name LPL Financial Holdings Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-3717839  
Entity Address, Address Line One 4707 Executive Drive,  
Entity Address, City or Town San Diego,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92121  
City Area Code (800)  
Local Phone Number 877-7210  
Title of 12(b) Security Common Stock - $0.001 par value per share  
Trading Symbol LPLA  
Security Exchange Name NASDAQ  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   79,982,861
Entity Central Index Key 0001397911  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Current Fiscal Year End Date --12-31