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Income Taxes (Schedule of Income Tax Expense Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Income Tax at Statutory Rate	$ 9,786us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 8,638us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 7,420us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Utility Plant Related	(572)us-gaap_IncomeTaxReconciliationDispositionOfAssets	(527)us-gaap_IncomeTaxReconciliationDispositionOfAssets	(442)us-gaap_IncomeTaxReconciliationDispositionOfAssets
State Income Taxes - Net	711us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	546us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	420us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Employee Benefits	(6)msex_EmployeeBenefits	(46)msex_EmployeeBenefits	(23)msex_EmployeeBenefits
Other	18us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	10us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	8us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Income Taxes	$ 9,937us-gaap_IncomeTaxExpenseBenefit	$ 8,621us-gaap_IncomeTaxExpenseBenefit	$ 7,383us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible employee benefit costs.

+ References

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 740

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to disposition of an asset.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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