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Income Taxes (Details) $ in Millions	Jun. 30, 2015 USD ($)
Income Taxes [Abstract]
Estimated Refunds of Tax Overpayments	$ 19.0

X

- Definition

Estimated amount of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing estimated refunds of overpayments.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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