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Stock-Based Compensation - Summary of Mastech's Restricted Stock Unit Activity (Detail) - Restricted Stock Units Activity [Member] - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding balance	17,804	25,059	30,843
Awarded	19,924	13,979	11,955
Released	(17,804)	(21,234)	(17,739)
Forfeited			0
Ending outstanding balance	19,924	17,804	25,059

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- Definition

Number of non-option equity instruments released to participants.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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