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Employee Benefit Plans (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Employee Benefit Plans [Line Items]
Cash contributions	$ 0.9
Other Benefits Plan [Member]
Employee Benefit Plans [Line Items]
Cash contributions	$ 0.9

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

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

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=msex_OtherBenefitsPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: