Name:	us-gaap_OtherCommitmentsAbstract
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Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_PurchaseObligationDueInNextTwelveMonths
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_PurchaseObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121594574&loc=d3e44360-110383

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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Amount of costs incurred to date for replacing all of the remaining known company-owned lead service lines.

No definition available.

Name:	yorw_CostsForCompanyOwnedLeadServiceLineReplacementsCostIncurredToDate
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of costs incurred to date for replacing all of the remaining customer-owned lead service lines connected to company-owned lead service lines under a four-year tariff modification.

No definition available.

Name:	yorw_CostsForCustomerOwnedLeadServiceLineReplacementsCostIncurredToDateUnderFourYearTariff
Namespace Prefix:	yorw_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of expected cost remaining for replacing all of the remaining customer-owned lead service lines connected to company-owned lead service lines under a nine-year tariff modification.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Number of lead customer-owned service lines to be replaced annually whenever they are discovered.

No definition available.

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Data Type:	xbrli:integerItemType
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Period Type:	duration

Percentage of the entity's employees that are under union contract.

No definition available.

Name:	yorw_PercentageOfEmployeesUnderUnionContract
Namespace Prefix:	yorw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Term of consent order agreement with the Pennsylvania Department of Environmental Protection involving the replacement of lead customer-owned service lines regardless of material used for company-owned service lines, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	yorw_TermOfConsentOrderAgreementToReplaceCustomerOwnedLeadServiceLines
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period of time within which the Company will replace all of the remaining company-owned lead service lines, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.