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LEGAL PROCEEDINGS (Details)	9 Months Ended
	Sep. 30, 2015 USD ($)
Legal Proceedings [Abstract]
Amounts paid to Chester Authority for amounts withheld related to specific rate increases	$ 3,100,000
Prejudgment and post judgment interest	$ 379,000
Interest rate used for prejudgment interest accrued	6.00%

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- Definition

Interest rate used for prejudgment interest accrued.

+ References

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

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- Definition

Amount of prejudgment and post judgment interest accrued and paid.

+ References

No definition available.

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Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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