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Commitments and Contingent Liabilities (Schedule of Purchased Water Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Purchased Water
Treated	$ 775	$ 764	$ 2,271	$ 2,344
Untreated	674	642	1,869	1,763
Total Costs	$ 1,449	$ 1,406	$ 4,140	$ 4,107

X

- Definition

Purchased Water

+ References

No definition available.

+ Details

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Namespace Prefix:	msex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to cost of treated water during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Refers to cost of untreated water during the period.

+ References

No definition available.

+ Details

Name:	msex_CostOfUntreatedWater
Namespace Prefix:	msex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Cost of water purchased, may include any water related assessment. If water is bought on a unit volume basis, would also be considered as commodity costs.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.2)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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