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Commitments and Contingent Liabilities - Schedule of Operating Lease ROU Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
ROU Asset at Lease Inception	$ 7,300	$ 7,300
Accumulated Amortization	(5,200)	(4,700)
ROU Asset	$ 2,117	$ 2,567

X

- Definition

Represents the amount of operating lease accumulated amortization.

+ References

No definition available.

+ Details

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

X

- Definition

Right of use asset at lease inception.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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