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Commitments and Contingent Liabilities (Schedule of Operating Lease ROU Assets and Lease Liabilities) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
ROU Asset at Lease Inception	$ 7,300
Accumulated Amortization	(1,200)
Current ROU Asset	$ 6,100

X

- Definition

Right of use asset at lease inception.

+ References

No definition available.

+ Details

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

X

- Definition

Accumulated amortization on ROU.

+ References

No definition available.

+ Details

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

X

- Definition

Right of use of assets current.

+ References

No definition available.

+ Details

Name:	msex_RightOfUseAssetsCurrent
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