Line of credit facility additional borrowing capacity upon certain conditions.

No definition available.

Name:	mhh_LineOfCreditFacilityAdditionalBorrowingCapacityUponCertainConditions
Namespace Prefix:	mhh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of eligible accounts receivable used to determine borrowings available under credit facility.

+ References

No definition available.

+ Details

Name:	mhh_PercentageOfEligibleAccountsReceivableUsedToDetermineBorrowingsAvailableUnderCreditFacility
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of eligible unbilled accounts used to determine borrowings available under credit facility.

+ References

No definition available.

+ Details

Name:	mhh_PercentageOfEligibleUnbilledAccountsUsedToDetermineBorrowingsAvailableUnderCreditFacility
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revolving credit facility percentage margin adjusted LIBOR rate.

+ References

No definition available.

+ Details

Name:	mhh_RevolvingCreditFacilityPercentageMarginAdjustedLiborRate
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Revolving credit facility percentage margin over base rate.

+ References

No definition available.

+ Details

Name:	mhh_RevolvingCreditFacilityPercentageMarginOverBaseRate
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Senior leverage ratio.

+ References

No definition available.

+ Details

Name:	mhh_SeniorLeverageRatio
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Term loan percentage margin adjusted LIBOR rate.

+ References

No definition available.

+ Details

Name:	mhh_TermLoanPercentageMarginAdjustedLiborRate
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Delayed draw term loan percentage margin over base rate.

+ References

No definition available.

+ Details

Name:	mhh_TermLoanPercentageMarginOverBaseRate
Namespace Prefix:	mhh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNoncurrentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the required periodic payments of both interest and principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=mhh_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mhh_SwingLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=mhh_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=mhh_PncBankNaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Credit Facility - Additional information (Detail) - USD ($)			1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 04, 2022	Oct. 01, 2020	Aug. 31, 2022	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2021
Line of Credit Facility [Line Items]
Current borrowing capacity under line of credit facility					$ 36,400,000			$ 32,400,000
Deferred financing costs					311,000			366,000
Senior leverage ratio				1.50%
Repayments of Debt					10,900,000	$ 3,300,000
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings amount					$ 2,200,000			13,100,000
Repayments of Debt			$ 7,600,000
Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Percentage of eligible accounts receivable							85.00%
Revolving Line of Credit [Member] \| United States [Member]
Line of Credit Facility [Line Items]
Percentage of eligible unbilled accounts							60.00%
Revolving Line of Credit [Member] \| Canada [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity							$ 10,000,000
Percentage of eligible accounts receivable							85.00%
Percentage of eligible unbilled accounts							60.00%
Revolving Line of Credit [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity							$ 5,000,000
Revolving Line of Credit [Member] \| Swing Loans [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity							$ 6,000,000
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					0.50%
PNC Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity					$ 53,100,000
Payment of deferred financing costs		$ 975,000
PNC Bank, N.A. [Member] \| Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity								$ 13,100,000
Credit facility, periodic payment		1,100,000
PNC Bank, N.A. [Member] \| Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 40,000,000
Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility percentage margin over base rate							1.25%
Term loan percentage margin over base rate							2.50%
Revolving credit facility percentage margin adjusted LIBOR rate							2.25%
Term loan percentage margin adjusted LIBOR rate							3.50%
Maximum [Member] \| PNC Bank, N.A. [Member] \| Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility additional borrowing capacity upon certain conditions	$ 20,000,000
Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility percentage margin over base rate							0.50%
Term loan percentage margin over base rate							1.75%
Revolving credit facility percentage margin adjusted LIBOR rate							1.50%
Term loan percentage margin adjusted LIBOR rate							2.75%