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Commitments and Contingent Liabilities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Period of wastewater agreement	20 years
Water and wastewater system agreement	USA-PA operates the City of Perth Amboy, New Jersey's water and wastewater systems under a 20-year agreement, which expires in 2018. In connection with the agreement with Perth Amboy, USA-PA entered into a 20-year subcontract with a wastewater operating company for the operation and maintenance of the Perth Amboy wastewater collection system.
Budgeted construction cost for construction program, 2014	$ 26.6
Guarant liabilty for AWM's performance	$ 0.3	$ 0.4
NJ Water Supply Authority [Member]
Commitment to purchase water	Middlesex has an agreement with the New Jersey Water Supply Authority (NJWSA) for the purchase of untreated water through November 30, 2023
Purchase commitment expiration date of contract	Nov. 30, 2023
Water purchase per commitment	27
Regulated Water Authority [Member]
Commitment to purchase water	Middlesex also has an agreement with a non-affiliated regulated water utility for the purchase of treated water.
Purchase commitment expiration date of contract	Feb. 27, 2016
Water purchase per commitment	3

Excluding long-term commitments, description of arrangements in which the entity must commit resources to supply goods or services to one or more customers, which may include identification of the goods or services to be furnished, identity of the buyer, pricing, effects on pricing (such as penalties) of failing to deliver minimum quantities required to be furnished, cancellation rights, and termination provisions.

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