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Capitalization (Schedule of Carrying Amount and Fair Value of Bonds) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Carrying amount [Member] |  |
First Mortgage Bonds | $ 88,628 | $ 87,471
SRF Bonds | 540 | 625
Fair value [Member] |  |
First Mortgage Bonds | 88,532 | 79,733
SRF Bonds | $ 542 | $ 628

X
- Definition Represents the aggregate of the first mortgage bonds reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
Name: | msex_FirstMortgageBondsFairValueDisclosure
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the aggregate of the state revolving fund reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
Name: | msex_StateRevolvingFundBondsFairValueDisclosure
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant