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LEGAL PROCEEDINGS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Legal Proceedings [Abstract]
Amounts paid to Chester Authority for amounts withheld related to specific rate increases	$ 3,100,000us-gaap_LitigationSettlementAmount
Late fee amount on amounts withheld to Chester Water Authority	300,000artna_LateFeeAmountOnAmountsWithheldToChesterWaterAuthority
Late fee percentage on amounts withheld to Chester Water Authority	10.00%artna_LateFeePercentageOnAmountsWithheldToChesterWaterAuthority
Prejudgment and post judgment interest	$ 379,000artna_PrejudgmentAndPostJudgmentInterest
Interest rate used for prejudgment interest accrued	6.00%artna_InterestRateUsedForPrejudgmentInterestAccrued

X

- Definition

Interest rate used for prejudgment interest accrued.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- 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
Balance Type:	credit
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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.

+ Details

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Namespace Prefix:	artna_
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- Details

Name:	artna_LegalProceedingsAbstract
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- Definition

Amount of prejudgment and post judgment interest accrued and paid

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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