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Cover Page - shares
 6 Months Ended
Jun. 30, 2021
Jul. 31, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Entity Registrant Name LegalZoom.com, Inc.  
Entity Central Index Key 0001286139  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Emerging Growth Company true  
Entity Small Business false  
Entity Ex Transition Period false  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol LZ  
Security Exchange Name NASDAQ  
Entity File Number 001-35618  
Entity Tax Identification Number 95-4752856  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 101 North Brand Boulevard  
Entity Address, Address Line Two 11th Floor Glendale  
Entity Address, City or Town California  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91203  
City Area Code 323  
Local Phone Number 962-8600  
Entity Common Stock, Shares Outstanding   196,904,824