75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Statement Of Financial Condition link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Statements Of Income And Changes In Plan Equity link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Description of the Plan link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Description of the Plan (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Summary of Significant Accounting Policies (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Refunds paid and payable to participants Document Fiscal Period Focus EBP, Description of Plan [Text Block] Description of the Plan EBP, Description of Plan [Line Items] EBP, Liability [Abstract] Liabilities: EBP, Accounting Policy [Line Items] EBP 2019 [Member] EBP 2019 [Member] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Liability to Participant Payable to participants and other Amendment Flag Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Payment to Participant [Policy Text Block] Payable to Participants Plan equity: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Document Type Entity Central Index Key Employee Benefit Plan Share Purchase Amount Employee Benefit Plan Share Purchase Amount Employee benefit plan share purchase amount EBP, Subsequent Event [Table] EBP, Accounting Policy [Table] EBP, Subsequent Event [Abstract] EBP, Basis of Accounting [Policy Text Block] Accounting Principles Current Fiscal Year End Date EBP, Description of Plan [Table] EBP, Liability for Investment Purchase Payable to purchase shares EBP, Noninterest-Bearing Cash Participant deposits due from Mastech Digital, Inc. Cost of shares purchased Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Cost Of Shares Purchased Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Cost Of Shares Purchased Minimum [Member] Total additions: EBP, Change in Net Asset Available for Benefit, Increase EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Liability Total liabilities EBP, Use of Estimate [Policy Text Block] Use of Estimates Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Payable To Purchase Shares Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Payable To Purchase Shares Payable to purchase shares Entity [Domain] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] EBP, Description of Plan and Accounting Change [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] Document Period End Date EBP, Subsequent Event [Text Block] Subsequent Events Cover [Abstract] End of period EBP, Net Asset Available for Benefit Beginning of period Plan Equity Plan equity Number of shares participants purchased EBP, Investment, Purchased, Number of Shares EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus EBP 2019 Employee Stock Purchase Plan [Member] EBP 2019 Employee Stock Purchase Plan EBP, Employer Contribution, Participant Compensation Matched, Percentage Employee benefit plan Percentage EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Asset Total assets Payable to Purchase Shares EBP, Contribution [Policy Text Block] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan participant contribution Legal Entity [Axis] EBP, Asset [Abstract] Asset: EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant contributions EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Subsequent Event [Line Items] EBP, Investment, Sold, Number of Shares Number of shares offered under the plan Maximum [Member] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Employee benefit plan shares reserved for future issuance Employee Benefit Plan Shares Reserved For Future Issuance Employee Benefit Plan Shares Reserved For Future Issuance Employee Benefit Plan Purchase Price Per Share Employee Benefit Plan Purchase Price Per Share Purchase price per share Entity Registrant Name Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net changes in plan equity Net changes in plan equity