| Document and Entity Information | Apr. 27, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001437226 |
| Document Type | 8-K |
| Document Period End Date | Apr. 27, 2022 |
| Entity Registrant Name | MASTECH DIGITAL, INC. |
| Entity Incorporation State Country Code | PA |
| Entity File Number | 001-34099 |
| Entity Tax Identification Number | 26-2753540 |
| Entity Address, Address Line One | 1305 Cherrington Parkway |
| Entity Address, Address Line Two | Suite 400 |
| Entity Address, City or Town | Moon Township |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 15108 |
| City Area Code | (412) |
| Local Phone Number | 787-2100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $.01 per share |
| Trading Symbol | MHH |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
