| Document and Entity Information | Mar. 25, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 25, 2021 |
| Entity Registrant Name | TRIPLE-S MANAGEMENT CORPORATION |
| Entity Incorporation, State or Country Code | PR |
| Entity File Number | 001-33865 |
| Entity Tax Identification Number | 66-0555678 |
| Entity Address, Address Line One | 1441 F.D. ROOSEVELT AVE. |
| Entity Address, City or Town | SAN JUAN |
| Entity Address, Country | PR |
| Entity Address, Postal Zip Code | 00920 |
| City Area Code | 787 |
| Local Phone Number | 749-4949 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001171662 |
| Title of 12(b) Security | Common Stock Class B, $1.00 par value |
| Trading Symbol | GTS |
| Security Exchange Name | NYSE |
