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Commitments and Contingent Liabilities (Details) - Schedule of operating lease ROU assets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule of operating lease ROU assets [Abstract]
ROU Asset at Lease Inception	$ 7.3	$ 7.3
Accumulated Amortization	(3.8)	(3.5)
Current ROU Asset	$ 3.5	$ 3.8

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- References

No definition available.

+ Details

Name:	msex_CommitmentsandContingentLiabilitiesDetailsScheduleofoperatingleaseROUassetsLineItems
Namespace Prefix:	msex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Right of use asset at lease inception.

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No definition available.

+ Details

Name:	msex_RightOfUseAssetAtLeaseInception
Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Accumulated amortization on ROU.

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No definition available.

+ Details

Name:	msex_RightOfUseAssetsAccumulatedAmortization
Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Right of use of assets current.

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No definition available.

+ Details

Name:	msex_RightOfUseAssetsCurrent
Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant