2.4.0.6 Html 312 451 1 false 88 0 false 16 false false R1.htm 0000 - Document - Document and Entity Information Sheet http://www.calwatergroup.com/role/DocumentAndEntityInformation Document and Entity Information true false R2.htm 0010 - Statement - Consolidated Balance Sheets Sheet http://www.calwatergroup.com/role/BalanceSheet Consolidated Balance Sheets false false R3.htm 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.calwatergroup.com/role/BalanceSheetParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 0020 - Statement - Consolidated Statements of Income Sheet http://www.calwatergroup.com/role/StatementOfIncome Consolidated Statements of Income false false R5.htm 0030 - Statement - Consolidated Statements of Common Stockholders' Equity Sheet http://www.calwatergroup.com/role/StatementOfStockholdersEquity Consolidated Statements of Common Stockholders' Equity false false R6.htm 0040 - Statement - Consolidated Statements of Cash Flows Sheet http://www.calwatergroup.com/role/CashFlows Consolidated Statements of Cash Flows false false R7.htm 1010 - Disclosure - ORGANIZATION AND OPERATIONS Sheet http://www.calwatergroup.com/role/DisclosureOrganizationAndOperations ORGANIZATION AND OPERATIONS false false R8.htm 1020 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES false false R9.htm 1030 - Disclosure - OTHER INCOME AND EXPENSES Sheet http://www.calwatergroup.com/role/DisclosureOtherIncomeAndExpenses OTHER INCOME AND EXPENSES false false R10.htm 1040 - Disclosure - INTANGIBLE ASSETS Sheet http://www.calwatergroup.com/role/DisclosureIntangibleAssets INTANGIBLE ASSETS false false R11.htm 1050 - Disclosure - PREFERRED STOCK Sheet http://www.calwatergroup.com/role/DisclosurePreferredStock PREFERRED STOCK false false R12.htm 1060 - Disclosure - COMMON STOCKHOLDERS' EQUITY Sheet http://www.calwatergroup.com/role/DisclosureCommonStockholdersEquity COMMON STOCKHOLDERS' EQUITY false false R13.htm 1070 - Disclosure - SHORT-TERM BORROWINGS Sheet http://www.calwatergroup.com/role/DisclosureShortTermBorrowings SHORT-TERM BORROWINGS false false R14.htm 1080 - Disclosure - LONG-TERM DEBT Sheet http://www.calwatergroup.com/role/DisclosureLongTermDebt LONG-TERM DEBT false false R15.htm 1090 - Disclosure - OTHER ACCRUED LIABILITIES Sheet http://www.calwatergroup.com/role/DisclosureOtherAccruedLiabilities OTHER ACCRUED LIABILITIES false false R16.htm 1100 - Disclosure - INCOME TAXES Sheet http://www.calwatergroup.com/role/DisclosureIncomeTaxes INCOME TAXES false false R17.htm 1110 - Disclosure - EMPLOYEE BENEFIT PLANS Sheet http://www.calwatergroup.com/role/DisclosureEmployeeBenefitPlans EMPLOYEE BENEFIT PLANS false false R18.htm 1120 - Disclosure - STOCK-BASED COMPENSATION PLANS Sheet http://www.calwatergroup.com/role/DisclosureStockBasedCompensationPlans STOCK-BASED COMPENSATION PLANS false false R19.htm 1130 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS Sheet http://www.calwatergroup.com/role/DisclosureFairValueOfFinancialInstruments FAIR VALUE OF FINANCIAL INSTRUMENTS false false R20.htm 1140 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.calwatergroup.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES false false R21.htm 1150 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) Sheet http://www.calwatergroup.com/role/DisclosureQuarterlyFinancialData QUARTERLY FINANCIAL DATA (UNAUDITED) false false R22.htm 1160 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatements CONDENSED CONSOLIDATING FINANCIAL STATEMENTS false false R23.htm 2020 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) false false R24.htm 3020 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) false false R25.htm 3030 - Disclosure - OTHER INCOME AND EXPENSES (Tables) Sheet http://www.calwatergroup.com/role/DisclosureOtherIncomeAndExpensesTables OTHER INCOME AND EXPENSES (Tables) false false R26.htm 3040 - Disclosure - INTANGIBLE ASSETS (Tables) Sheet http://www.calwatergroup.com/role/DisclosureIntangibleAssetsTables INTANGIBLE ASSETS (Tables) false false R27.htm 3070 - Disclosure - SHORT-TERM BORROWINGS (Tables) Sheet http://www.calwatergroup.com/role/DisclosureShortTermBorrowingsTables SHORT-TERM BORROWINGS (Tables) false false R28.htm 3080 - Disclosure - LONG-TERM DEBT (Tables) Sheet http://www.calwatergroup.com/role/DisclosureLongTermDebtTables LONG-TERM DEBT (Tables) false false R29.htm 3090 - Disclosure - OTHER ACCRUED LIABILITIES (Table) Sheet http://www.calwatergroup.com/role/DisclosureOtherAccruedLiabilitiesTable OTHER ACCRUED LIABILITIES (Table) false false R30.htm 3100 - Disclosure - INCOME TAXES (Tables) Sheet http://www.calwatergroup.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) false false R31.htm 3110 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables) Sheet http://www.calwatergroup.com/role/DisclosureEmployeeBenefitPlansTables EMPLOYEE BENEFIT PLANS (Tables) false false R32.htm 3120 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables) Sheet http://www.calwatergroup.com/role/DisclosureStockBasedCompensationPlansTables STOCK-BASED COMPENSATION PLANS (Tables) false false R33.htm 3140 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.calwatergroup.com/role/DisclosureCommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) false false R34.htm 3150 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) Sheet http://www.calwatergroup.com/role/DisclosureQuarterlyFinancialDataTables QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) false false R35.htm 3160 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsTables CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Tables) false false R36.htm 4010 - Disclosure - ORGANIZATION AND OPERATIONS (Details) Sheet http://www.calwatergroup.com/role/DisclosureOrganizationAndOperationsDetails ORGANIZATION AND OPERATIONS (Details) false false R37.htm 4020 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) false false R38.htm 4021 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails2 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) false false R39.htm 4022 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails3 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) false false R40.htm 4023 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails4 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) false false R41.htm 4024 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails5 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) false false R42.htm 4025 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 6) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails6 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 6) false false R43.htm 4026 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 7) Sheet http://www.calwatergroup.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails7 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 7) false false R44.htm 4030 - Disclosure - OTHER INCOME AND EXPENSES (Details) Sheet http://www.calwatergroup.com/role/DisclosureOtherIncomeAndExpensesDetails OTHER INCOME AND EXPENSES (Details) false false R45.htm 4040 - Disclosure - INTANGIBLE ASSETS (Details) Sheet http://www.calwatergroup.com/role/DisclosureIntangibleAssetsDetails INTANGIBLE ASSETS (Details) false false R46.htm 4050 - Disclosure - PREFERRED STOCK (Details) Sheet http://www.calwatergroup.com/role/DisclosurePreferredStockDetails PREFERRED STOCK (Details) false false R47.htm 4060 - Disclosure - COMMON STOCKHOLDERS' EQUITY (Details) Sheet http://www.calwatergroup.com/role/DisclosureCommonStockholdersEquityDetails COMMON STOCKHOLDERS' EQUITY (Details) false false R48.htm 4070 - Disclosure - SHORT-TERM BORROWINGS (Details) Sheet http://www.calwatergroup.com/role/DisclosureShortTermBorrowingsDetails SHORT-TERM BORROWINGS (Details) false false R49.htm 4080 - Disclosure - LONG-TERM DEBT (Details) Sheet http://www.calwatergroup.com/role/DisclosureLongTermDebtDetails LONG-TERM DEBT (Details) false false R50.htm 4090 - Disclosure - OTHER ACCRUED LIABILITIES (Details) Sheet http://www.calwatergroup.com/role/DisclosureOtherAccruedLiabilitiesDetails OTHER ACCRUED LIABILITIES (Details) false false R51.htm 4100 - Disclosure - INCOME TAXES (Details) Sheet http://www.calwatergroup.com/role/DisclosureIncomeTaxesDetails INCOME TAXES (Details) false false R52.htm 4101 - Disclosure - INCOME TAXES (Details 2) Sheet http://www.calwatergroup.com/role/DisclosureIncomeTaxesDetails2 INCOME TAXES (Details 2) false false R53.htm 4110 - Disclosure - EMPLOYEE BENEFIT PLANS (Details) Sheet http://www.calwatergroup.com/role/DisclosureEmployeeBenefitPlansDetails EMPLOYEE BENEFIT PLANS (Details) false false R54.htm 4111 - Disclosure - EMPLOYEE BENEFIT PLANS (Details 2) Sheet http://www.calwatergroup.com/role/DisclosureEmployeeBenefitPlansDetails2 EMPLOYEE BENEFIT PLANS (Details 2) false false R55.htm 4112 - Disclosure - EMPLOYEE BENEFIT PLANS (Details 3) Sheet http://www.calwatergroup.com/role/DisclosureEmployeeBenefitPlansDetails3 EMPLOYEE BENEFIT PLANS (Details 3) false false R56.htm 4120 - Disclosure - STOCK-BASED COMPENSATION PLANS (Details) Sheet http://www.calwatergroup.com/role/DisclosureStockBasedCompensationPlansDetails STOCK-BASED COMPENSATION PLANS (Details) false false R57.htm 4130 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) Sheet http://www.calwatergroup.com/role/DisclosureFairValueOfFinancialInstrumentsDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) false false R58.htm 4140 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.calwatergroup.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) false false R59.htm 4141 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details 2) Sheet http://www.calwatergroup.com/role/DisclosureCommitmentsAndContingenciesDetails2 COMMITMENTS AND CONTINGENCIES (Details 2) false false R60.htm 4150 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) Sheet http://www.calwatergroup.com/role/DisclosureQuarterlyFinancialDataDetails QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) false false R61.htm 4160 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsDetails CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details) false false R62.htm 4161 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 2) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsDetails2 CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 2) false false R63.htm 4162 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 3) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsDetails3 CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 3) false false R64.htm 4163 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 4) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsDetails4 CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 4) false false R65.htm 4164 - Disclosure - CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 5) Sheet http://www.calwatergroup.com/role/DisclosureCondensedConsolidatingFinancialStatementsDetails5 CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 5) false false R66.htm 8040 - Disclosure - ACQUISITIONS (Details) Sheet http://www.calwatergroup.com/role/DisclosureAcquisitionsDetails ACQUISITIONS (Details) false false All Reports Book All Reports Element us-gaap_DebtInstrumentBasisSpreadOnVariableRate had a mix of decimals attribute values: 4 5. Element us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1 had a mix of decimals attribute values: 1 2. 'Shares' elements on report '4010 - Disclosure - ORGANIZATION AND OPERATIONS (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4024 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5)' had a mix of different decimal attribute values. 'Shares' elements on report '4026 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 7)' had a mix of different decimal attribute values. 'Monetary' elements on report '4070 - Disclosure - SHORT-TERM BORROWINGS (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4080 - Disclosure - LONG-TERM DEBT (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4100 - Disclosure - INCOME TAXES (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '4141 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details 2)' had a mix of different decimal attribute values. Process Flow-Through: 0010 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 0015 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Jun. 08, 2011' Process Flow-Through: 0020 - Statement - Consolidated Statements of Income Process Flow-Through: 0040 - Statement - Consolidated Statements of Cash Flows cwt-20111231.xml cwt-20111231.xsd cwt-20111231_cal.xml cwt-20111231_def.xml cwt-20111231_lab.xml cwt-20111231_pre.xml true true