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LEGAL PROCEEDINGS (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
LEGAL PROCEEDINGS [Abstract]
Amount to pay Chester Authority for amounts withheld related to specific rate increases	$ 3,100,000
Late fee amount on amounts withheld to Chester Water Authority	300,000
Late fee percentage on amounts withheld to Chester Water Authority	10.00%
Prejudgment interest accrued	$ 378,000
Interest rate used for prejudgment interest accrued	6.00%

X

- Definition

Interest rate used for prejudgment interest accrued.

+ References

No definition available.

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- Definition

Amount of late fee withheld related to specific Chester Water Authority rate increases

+ References

No definition available.

+ Details

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Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Percentage of late fee on the amounts withheld related to specific Chester Water Authority rate increases

+ References

No definition available.

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- Definition

Amount of prejudgment interest accrued

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No definition available.

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- Definition

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

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No definition available.

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