| Document And Entity Information | Aug. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 10, 2021 |
| Entity Registrant Name | Sykes Enterprises, Incorporated |
| Entity Central Index Key | 0001010612 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-28274 |
| Entity Incorporation, State or Country Code | FL |
| Entity Tax Identification Number | 56-1383460 |
| Entity Address, Address Line One | 400 North Ashley Drive |
| Entity Address, Address Line Two | Suite 2800 |
| Entity Address, City or Town | Tampa |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33602 |
| City Area Code | 813 |
| Local Phone Number | 274-1000 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | SYKE |
| Security Exchange Name | NASDAQ |
