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Business Combinations - Summary of Source of Funds (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jul. 13, 2017	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
Business Acquisition [Line Items]
Sale of common stock in a private placement transactions		$ 168	$ 6,000
Revolving Line of Credit [Member]
Business Acquisition [Line Items]
Outstanding borrowings amount		$ 9,500		$ 13,600
Info Trellis Inc [Member]
Business Acquisition [Line Items]
Cash balances on hand	$ 341
Sale of common stock in a private placement transactions	6,000
Payoff of Mastech Digital's previous credit facility	(10,091)
Cash paid at Closing	35,750
Info Trellis Inc [Member] | Term Loan Debt Facility [Member]
Business Acquisition [Line Items]
Outstanding borrowings amount	30,500
Info Trellis Inc [Member] | Revolving Line of Credit [Member]
Business Acquisition [Line Items]
Outstanding borrowings amount	$ 9,000

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow from the additional capital contribution to the entity.

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