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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement of Cash Flows [Abstract]
Allowance for Funds Used During Construction	$ 299	$ 359	$ 421

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- Definition

AFUDC is a component of construction costs representing net cost of borrowed funds and a reasonable rate on other funds used during the period of construction.

+ References

No definition available.

+ Details

Name:	MSEX_AllowanceForFundsUsedDuringConstruction
Namespace Prefix:	MSEX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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