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Capitalization (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Carrying amount |  |
Bonds | $ 91,938 | $ 86,577
SRF Bonds | 708 | 793
Fair value |  |
Bonds | 93,556 | 87,283
SRF Bonds | $ 712 | $ 799

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

X
- 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