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v3.20.4

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Liabilities Valuation Allowance | $ 179 | $ 7

X
- 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