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Business Combinations - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement provides for total aggregate commitment | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 48,710,000 | $ 47,383,000 | $ 47,583,000 | $ 50,425,000 | $ 50,360,000 | $ 49,543,000 | $ 48,472,000 | $ 45,199,000 | $ 194,101,000 | $ 193,574,000 | $ 177,164,000
Net income (loss) |  | $ 2,025,000 | $ 2,998,000 | $ 2,969,000 | $ 1,869,000 | $ 2,274,000 | $ 1,949,000 | $ 5,958,000 | $ 964,000 | 9,861,000 | $ 11,145,000 | $ 6,691,000
Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement provides for total aggregate commitment | 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement provides for total aggregate commitment | 17,500,000 |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Credit Facility | 7,500,000 |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Credit Facility | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Amber Leaf Partners Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, description | On October 1, 2020, Mastech Digital, Inc., through its wholly-owned subsidiary Mastech Digital Data, Inc., acquired all of the outstanding shares of AmberLeaf Partners, Inc. (“AmberLeaf”). Under the terms of the Share Purchase Agreement executed in connection with the AmberLeaf acquisition (the “Purchase Agreement”), |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 9,664,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration in deferred cash payments | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |
Transaction costs related to acquisition |  |  |  |  |  |  |  |  |  | 650,000 |  |
Write off of Deferred Finance Costs |  |  |  |  |  |  |  |  |  | 185,000 |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,400,000 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (400,000) |  |

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