Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Details

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- Definition

Percentage of variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

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

- Definition

The amount of gains or losses on a an interest rate swap capitalized in the period to regulatory assets or liabilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount reclassified in the period to interest expense from regulatory assets or liabilities as a result of interest rate swap settlements.

+ References

No definition available.

+ Details

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Namespace Prefix:	yorw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The estimated amount as of the balance sheet date expected to be reclassified to interest expense from regulatory assets or liabilities within the next twelve months as a result of interest rate swap settlements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Net payment on the swaps with counterparty. Swaps are used to effectively convert variable-rate debt to a fixed rate.

+ References

No definition available.

+ Details

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- Definition

The potential amount payable to the interest rate swap counter party due to certain violations of the terms and conditions of the swap agreement.

+ References

No definition available.

+ Details

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

- Details

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- Details

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Interest Rate Swap Agreement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Interest Rate Swap Agreement [Abstract]
Long-term debt	$ 84,874us-gaap_DebtInstrumentCarryingAmount		$ 84,885us-gaap_DebtInstrumentCarryingAmount
Interest Rate Swap [Member]
Interest Rate Swap Agreement [Abstract]
Notional amount of swap	12,000
Fixed interest rate (in hundredths)	3.16%
Net payment rate on swaps (in hundredths)	2.98%	2.99%
Interest rate swap settlements reclassified to interest expense	91
Interest rate swap gain (loss) capitalized	(343)	(385)
Interest rate swap settlements to be reclassified during the next 12 months	354
Potential payment to counterparty	2,934
Maturity date of swap	Oct. 01, 2029
LIBOR [Member] \| Interest Rate Swap [Member]
Interest Rate Swap Agreement [Abstract]
Percentage of variable interest rate (in hundredths)	59.00%
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]
Interest Rate Swap Agreement [Abstract]
Long-term debt	$ 12,000		$ 12,000