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v3.25.3

Income Taxes - Additional Information (Detail) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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UNITED KINGDOM |  |
Deferred Tax Liabilities Valuation Allowance | $ 452,000 | $ 452,000

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- Definition Deferred tax liabilities valuation allowance. + References No definition available. + Details
Name: | mhh_DeferredTaxLiabilitiesValuationAllowance
Namespace Prefix: | mhh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |