| Document and Entity Information | Jun. 30, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2021 |
| Entity Registrant Name | Primerica, Inc. |
| Entity Central Index Key | 0001475922 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-34680 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 27-1204330 |
| Entity Address, Address Line One | 1 Primerica Parkway |
| Entity Address, City or Town | Duluth |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30099 |
| City Area Code | 770 |
| Local Phone Number | 381-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock |
| Trading Symbol | PRI |
| Name of each exchange on which registered | NYSE |
