| Cover | Nov. 10, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 10, 2022 |
| Entity Registrant Name | LegalZoom.com, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35618 |
| Entity Tax Identification Number | 95-4752856 |
| Entity Address, Address Line One | 101 North Brand Boulevard |
| Entity Address, Address Line Two | 11th Floor |
| Entity Address, City or Town | Glendale |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 91203 |
| City Area Code | 323 |
| Local Phone Number | 962-8600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | LZ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001286139 |
