2.4.0.6 Html 71 153 1 false 24 0 false 4 false false R1.htm 000990 - Document - Document And Entity Information Sheet http://yorkwater.com/role/DocumentAndEntityInformation Document And Entity Information true false R2.htm 010000 - Statement - Balance Sheets (Unaudited) Sheet http://yorkwater.com/role/BalanceSheetsUnaudited Balance Sheets (Unaudited) false false R3.htm 010100 - Statement - Balance Sheets (Unaudited) (Parenthetical) Sheet http://yorkwater.com/role/BalanceSheetsUnauditedParenthetical Balance Sheets (Unaudited) (Parenthetical) false false R4.htm 020000 - Statement - Statements of Income (Unaudited) Sheet http://yorkwater.com/role/StatementsOfIncomeUnaudited Statements of Income (Unaudited) false false R5.htm 030000 - Statement - Statements of Common Stockholders' Equity (Unaudited) Sheet http://yorkwater.com/role/StatementsOfCommonStockholdersEquityUnaudited Statements of Common Stockholders' Equity (Unaudited) false false R6.htm 030100 - Statement - Statements of Common Stockholders' Equity (Unaudited) (Parenthetical) Sheet http://yorkwater.com/role/StatementsOfCommonStockholdersEquityUnauditedParenthetical Statements of Common Stockholders' Equity (Unaudited) (Parenthetical) false false R7.htm 040000 - Statement - Statements of Cash Flows (Unaudited) Sheet http://yorkwater.com/role/StatementsOfCashFlowsUnaudited Statements of Cash Flows (Unaudited) false false R8.htm 040100 - Statement - Statements of Cash Flows (Unaudited) (Parenthetical) Sheet http://yorkwater.com/role/StatementsOfCashFlowsUnauditedParenthetical Statements of Cash Flows (Unaudited) (Parenthetical) false false R9.htm 060100 - Disclosure - Basis of Presentation Sheet http://yorkwater.com/role/BasisOfPresentation Basis of Presentation false false R10.htm 060200 - Disclosure - Basic Earnings Per Share Sheet http://yorkwater.com/role/BasicEarningsPerShare Basic Earnings Per Share false false R11.htm 060250 - Disclosure - Commitments Sheet http://yorkwater.com/role/Commitments Commitments false false R12.htm 060400 - Disclosure - Pensions Sheet http://yorkwater.com/role/Pensions Pensions false false R13.htm 060500 - Disclosure - Interest Rate Swap Agreement Sheet http://yorkwater.com/role/InterestRateSwapAgreement Interest Rate Swap Agreement false false R14.htm 060600 - Disclosure - Fair Value Measurements Sheet http://yorkwater.com/role/FairValueMeasurements Fair Value Measurements false false R15.htm 060700 - Disclosure - Debt Sheet http://yorkwater.com/role/Debt Debt false false R16.htm 060750 - Disclosure - Acquisitions Sheet http://yorkwater.com/role/Acquisitions Acquisitions false false R17.htm 060800 - Disclosure - Rate Matters Sheet http://yorkwater.com/role/RateMatters Rate Matters false false R18.htm 080400 - Disclosure - Pensions (Tables) Sheet http://yorkwater.com/role/PensionsTables Pensions (Tables) false false R19.htm 080600 - Disclosure - Fair Value Measurements (Tables) Sheet http://yorkwater.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) false false R20.htm 080700 - Disclosure - Debt (Tables) Sheet http://yorkwater.com/role/DebtTables Debt (Tables) false false R21.htm 090200 - Disclosure - Basic Earnings Per Share (Details) Sheet http://yorkwater.com/role/BasicEarningsPerShareDetails Basic Earnings Per Share (Details) false false R22.htm 090250 - Disclosure - Commitments and Contingencies (Details) Sheet http://yorkwater.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R23.htm 090400 - Disclosure - Pensions (Details) Sheet http://yorkwater.com/role/PensionsDetails Pensions (Details) false false R24.htm 090500 - Disclosure - Interest Rate Swap Agreement (Details) Sheet http://yorkwater.com/role/InterestRateSwapAgreementDetails Interest Rate Swap Agreement (Details) false false R25.htm 090600 - Disclosure - Fair Value Measurements (Details) Sheet http://yorkwater.com/role/FairValueMeasurementsDetails Fair Value Measurements (Details) false false R26.htm 090700 - Disclosure - Debt (Details) Sheet http://yorkwater.com/role/DebtDetails Debt (Details) false false R27.htm 090750 - Disclosure - Acquisitions (Details) Sheet http://yorkwater.com/role/AcquisitionsDetails Acquisitions (Details) false false R28.htm 090800 - Disclosure - Rate Matters (Details) Sheet http://yorkwater.com/role/RateMattersDetails Rate Matters (Details) false false All Reports Book All Reports Process Flow-Through: 010000 - Statement - Balance Sheets (Unaudited) Process Flow-Through: Removing column 'Sep. 30, 2011' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 010100 - Statement - Balance Sheets (Unaudited) (Parenthetical) Process Flow-Through: 020000 - Statement - Statements of Income (Unaudited) Process Flow-Through: 030100 - Statement - Statements of Common Stockholders' Equity (Unaudited) (Parenthetical) Process Flow-Through: 040000 - Statement - Statements of Cash Flows (Unaudited) Process Flow-Through: 040100 - Statement - Statements of Cash Flows (Unaudited) (Parenthetical) yorw-20120930.xml yorw-20120930.xsd yorw-20120930_cal.xml yorw-20120930_def.xml yorw-20120930_lab.xml yorw-20120930_pre.xml true true