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Income Taxes (Schedule of Net Deferred Tax Liability) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Income Taxes [Abstract] |  |
Utility Plant Related | $ 43,996,000 msex_DeferredTaxLiabilitiesUtilityPlantRelated | $ 41,912,000 msex_DeferredTaxLiabilitiesUtilityPlantRelated
Customer Advances | (3,570,000)msex_DeferredTaxAssetsCustomerAdvances | (3,598,000)msex_DeferredTaxAssetsCustomerAdvances
Employee Benefits | 7,223,000 us-gaap_DeferredTaxLiabilitiesOther | 1,121,000 us-gaap_DeferredTaxLiabilitiesOther
Investment Tax Credits (ITC) | 910,000 msex_DeferredTaxLiabilitiesInvestmentTaxCredits | 989,000 msex_DeferredTaxLiabilitiesInvestmentTaxCredits
Other | (343,000)us-gaap_DeferredTaxAssetsOther | (325,000)us-gaap_DeferredTaxAssetsOther
Total Deferred Tax Liability and ITC | 48,216,000 us-gaap_DeferredTaxLiabilities | 40,099,000 us-gaap_DeferredTaxLiabilities
Income Taxes Receivable | $ 6,800,000 us-gaap_IncomeTaxReceivable |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived customer advances. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax liabilities attributable to deductible investment tax credits. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences of utility plant related. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Subparagraph c -Article 7 + Details
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