3.24.0.1 html 262 461 1 true 84 0 false 7 false false R1.htm 0000001 - Document - Document and Entity Information Sheet http://www.clearwaterpaper.com/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.clearwaterpaper.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 0000003 - Statement - Consolidated Balance Sheets Sheet http://www.clearwaterpaper.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 0000004 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.clearwaterpaper.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 0000005 - Statement - Consolidated Statements of Operations Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 5 false false R6.htm 0000006 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 6 false false R7.htm 0000007 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 7 false false R8.htm 0000008 - Statement - Consolidated Statements of Cash Flows Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 0000009 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofStockholdersEquity Consolidated Statements of Stockholders' Equity Statements 9 false false R10.htm 0000010 - Statement - Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity (Parenthetical) Sheet http://www.clearwaterpaper.com/role/ConsolidatedStatementsofStockholdersEquityConsolidatedStatementsofStockholdersEquityParenthetical Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity (Parenthetical) Statements 10 false false R11.htm 0000011 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 11 false false R12.htm 0000012 - Disclosure - Recently Adopted and New Accounting Standards Sheet http://www.clearwaterpaper.com/role/RecentlyAdoptedandNewAccountingStandards Recently Adopted and New Accounting Standards Notes 12 false false R13.htm 0000013 - Disclosure - Fair Value Measurements Sheet http://www.clearwaterpaper.com/role/FairValueMeasurements Fair Value Measurements Notes 13 false false R14.htm 0000015 - Disclosure - Goodwill and Intangible Assets Sheet http://www.clearwaterpaper.com/role/GoodwillandIntangibleAssets Goodwill and Intangible Assets Notes 14 false false R15.htm 0000016 - Disclosure - Income Taxes Sheet http://www.clearwaterpaper.com/role/IncomeTaxes Income Taxes Notes 15 false false R16.htm 0000017 - Disclosure - Debt Sheet http://www.clearwaterpaper.com/role/Debt Debt Notes 16 false false R17.htm 0000018 - Disclosure - Other Operating Charges, net Sheet http://www.clearwaterpaper.com/role/OtherOperatingChargesnet Other Operating Charges, net Notes 17 false false R18.htm 0000019 - Disclosure - Non Operating Income and Expenses Sheet http://www.clearwaterpaper.com/role/NonOperatingIncomeandExpenses Non Operating Income and Expenses Notes 18 false false R19.htm 0000020 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlans Savings, Pension and Other Postretirement Employee Benefit Plans Notes 19 false false R20.htm 0000021 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.clearwaterpaper.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 20 false false R21.htm 0000022 - Disclosure - Earnings Per Share Sheet http://www.clearwaterpaper.com/role/EarningsPerShare Earnings Per Share Notes 21 false false R22.htm 0000023 - Disclosure - Stockholders' Equity Sheet http://www.clearwaterpaper.com/role/StockholdersEquity Stockholders' Equity Notes 22 false false R23.htm 0000024 - Disclosure - Commitments and Contingencies Sheet http://www.clearwaterpaper.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 23 false false R24.htm 0000025 - Disclosure - Segment Information Sheet http://www.clearwaterpaper.com/role/SegmentInformation Segment Information Notes 24 false false R25.htm 0000026 - Disclosure - Subsequent Events Sheet http://www.clearwaterpaper.com/role/SubsequentEvents Subsequent Events Notes 25 false false R26.htm 9954471 - Disclosure - Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies) Policies http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPolicies 26 false false R27.htm 9954472 - Disclosure - Accounting Policies (Tables) Sheet http://www.clearwaterpaper.com/role/AccountingPoliciesTables Accounting Policies (Tables) Tables 27 false false R28.htm 9954474 - Disclosure - Leases (Tables) Sheet http://www.clearwaterpaper.com/role/LeasesTables Leases (Tables) Tables 28 false false R29.htm 9954475 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.clearwaterpaper.com/role/GoodwillandIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.clearwaterpaper.com/role/GoodwillandIntangibleAssets 29 false false R30.htm 9954476 - Disclosure - Income Taxes (Tables) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.clearwaterpaper.com/role/IncomeTaxes 30 false false R31.htm 9954477 - Disclosure - Debt (Tables) Sheet http://www.clearwaterpaper.com/role/DebtTables Debt (Tables) Tables http://www.clearwaterpaper.com/role/Debt 31 false false R32.htm 9954478 - Disclosure - Other Operating Charges, net (Tables) Sheet http://www.clearwaterpaper.com/role/OtherOperatingChargesnetTables Other Operating Charges, net (Tables) Tables http://www.clearwaterpaper.com/role/OtherOperatingChargesnet 32 false false R33.htm 9954479 - Disclosure - Non Operating Income and Expenses (Tables) Sheet http://www.clearwaterpaper.com/role/NonOperatingIncomeandExpensesTables Non Operating Income and Expenses (Tables) Tables http://www.clearwaterpaper.com/role/NonOperatingIncomeandExpenses 33 false false R34.htm 9954480 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans (Tables) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansTables Savings, Pension and Other Postretirement Employee Benefit Plans (Tables) Tables http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlans 34 false false R35.htm 9954481 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.clearwaterpaper.com/role/AccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) Tables http://www.clearwaterpaper.com/role/AccumulatedOtherComprehensiveLoss 35 false false R36.htm 9954482 - Disclosure - Earnings Per Share (Tables) Sheet http://www.clearwaterpaper.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.clearwaterpaper.com/role/EarningsPerShare 36 false false R37.htm 9954483 - Disclosure - Stockholders' Equity (Tables) Sheet http://www.clearwaterpaper.com/role/StockholdersEquityTables Stockholders' Equity (Tables) Tables http://www.clearwaterpaper.com/role/StockholdersEquity 37 false false R38.htm 9954485 - Disclosure - Segment Information (Tables) Sheet http://www.clearwaterpaper.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.clearwaterpaper.com/role/SegmentInformation 38 false false R39.htm 9954487 - Disclosure - Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesCashandCashEquivalentsDetails Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 39 false false R40.htm 9954488 - Disclosure - Summary of Significant Accounting Policies (Accounts Receivables) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesAccountsReceivablesDetails Summary of Significant Accounting Policies (Accounts Receivables) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 40 false false R41.htm 9954489 - Disclosure - Summary of Significant Accounting Policies (Inventories) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesInventoriesDetails Summary of Significant Accounting Policies (Inventories) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 41 false false R42.htm 9954490 - Disclosure - Summary of Significant Accounting Policies (PP&E) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesPPEDetails Summary of Significant Accounting Policies (PP&E) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 42 false false R43.htm 9954491 - Disclosure - Summary of Significant Accounting Policies (Accounts Receivables Arrangement - Factoring) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesAccountsReceivablesArrangementFactoringDetails Summary of Significant Accounting Policies (Accounts Receivables Arrangement - Factoring) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 43 false false R44.htm 9954492 - Disclosure - Summary of Significant Accounting Policies (Environmental and ARO) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesEnvironmentalandARODetails Summary of Significant Accounting Policies (Environmental and ARO) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 44 false false R45.htm 9954493 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 45 false false R46.htm 9954494 - Disclosure - Summary of Significant Accounting Policies (Revenue Recog) (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesRevenueRecogDetails Summary of Significant Accounting Policies (Revenue Recog) (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 46 false false R47.htm 9954495 - Disclosure - Summary of Significant Accounting Policies (Accounts Payable and Accrued Liabilities (Details) Sheet http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesAccountsPayableandAccruedLiabilitiesDetails Summary of Significant Accounting Policies (Accounts Payable and Accrued Liabilities (Details) Details http://www.clearwaterpaper.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesPolicies 47 false false R48.htm 9954497 - Disclosure - Leases (Details) Sheet http://www.clearwaterpaper.com/role/LeasesDetails Leases (Details) Details http://www.clearwaterpaper.com/role/LeasesTables 48 false false R49.htm 9954498 - Disclosure - Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Details) Sheet http://www.clearwaterpaper.com/role/GoodwillandIntangibleAssetsEstimatedFutureAmortizationExpenseRelatedtoIntangibleAssetsDetails Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets (Details) Details 49 false false R50.htm 9954499 - Disclosure - Goodwill and Intangible Assets - Details (Details) Sheet http://www.clearwaterpaper.com/role/GoodwillandIntangibleAssetsDetailsDetails Goodwill and Intangible Assets - Details (Details) Details 50 false false R51.htm 9954500 - Disclosure - Income Taxes - Provision (Benefit) for Income Taxes (Details) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesProvisionBenefitforIncomeTaxesDetails Income Taxes - Provision (Benefit) for Income Taxes (Details) Details 51 false false R52.htm 9954501 - Disclosure - Income Taxes - Income Tax Reconciliation (Details) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesIncomeTaxReconciliationDetails Income Taxes - Income Tax Reconciliation (Details) Details 52 false false R53.htm 9954502 - Disclosure - Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesTaxEffectsofSignificantTemporaryDifferencesCreatingDeferredTaxAssetsandLiabilitiesDetails Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) Details 53 false false R54.htm 9954503 - Disclosure - - Net Deferred Tax Assets (Liabilities) (Details) Sheet http://www.clearwaterpaper.com/role/NetDeferredTaxAssetsLiabilitiesDetails - Net Deferred Tax Assets (Liabilities) (Details) Details 54 false false R55.htm 9954505 - Disclosure - Income Taxes - Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesTaxCreditsandLossesSubjecttoExpirationbyMajorJurisdictionsDetails Income Taxes - Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) Details 55 false false R56.htm 9954506 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 56 false false R57.htm 9954507 - Disclosure - Income Taxes - Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) Sheet http://www.clearwaterpaper.com/role/IncomeTaxesRollForwardofUnrecognizedTaxBenefitsandAssociatedInterestandPenaltiesIncludedinBalanceSheetDetails Income Taxes - Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) Details 57 false false R58.htm 9954508 - Disclosure - Debt - Additional Information (Details) Sheet http://www.clearwaterpaper.com/role/DebtAdditionalInformationDetails Debt - Additional Information (Details) Details 58 false false R59.htm 9954509 - Disclosure - Other Operating Charges, net (Details) Sheet http://www.clearwaterpaper.com/role/OtherOperatingChargesnetDetails Other Operating Charges, net (Details) Details http://www.clearwaterpaper.com/role/OtherOperatingChargesnetTables 59 false false R60.htm 9954510 - Disclosure - Non Operating Income and Expenses (Details) Sheet http://www.clearwaterpaper.com/role/NonOperatingIncomeandExpensesDetails Non Operating Income and Expenses (Details) Details http://www.clearwaterpaper.com/role/NonOperatingIncomeandExpensesTables 60 false false R61.htm 9954511 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansChangesinBenefitObligationPlanAssetsandFundedStatusforCompanySponsoredBenefitPlansDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Details) Details 61 false false R62.htm 9954512 - Disclosure - - Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) Sheet http://www.clearwaterpaper.com/role/CertainPensionPlanswithAccumulatedBenefitObligationsinExcessofPlanAssetsDetails - Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) Details 62 false false R63.htm 9954513 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Pre-tax Components of Net Periodic Cost (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansPretaxComponentsofNetPeriodicCostDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Pre-tax Components of Net Periodic Cost (Details) Details 63 false false R64.htm 9954514 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansWeightedAverageAssumptionsUsedtoDetermineBenefitObligationDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligation (Details) Details 64 false false R65.htm 9954515 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Cost (Benefit) (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansWeightedAverageAssumptionsUsedtoDetermineNetPeriodicCostBenefitDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Cost (Benefit) (Details) Details 65 false false R66.htm 9954516 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansInvestmentsatFairValueforCompanySponsoredPensionBenefitPlansWithinFairValueHierarchyDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) Details 66 false false R67.htm 9954517 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Long Term Asset Allocation Ranges (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansLongTermAssetAllocationRangesDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Long Term Asset Allocation Ranges (Details) Details 67 false false R68.htm 9954518 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Estimated Future Benefit Payments (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansEstimatedFutureBenefitPaymentsDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Estimated Future Benefit Payments (Details) Details 68 false false R69.htm 9954519 - Disclosure - Savings, Pension and Other Postretirement Employee Benefit Plans - Multiemployer Defined Benefit Plans (Details) Sheet http://www.clearwaterpaper.com/role/SavingsPensionandOtherPostretirementEmployeeBenefitPlansMultiemployerDefinedBenefitPlansDetails Savings, Pension and Other Postretirement Employee Benefit Plans - Multiemployer Defined Benefit Plans (Details) Details 69 false false R70.htm 9954520 - Disclosure - - Additional Information (Details) Sheet http://www.clearwaterpaper.com/role/AdditionalInformationDetails - Additional Information (Details) Details 70 false false R71.htm 9954521 - Disclosure - Accumulated Other Comprehensive Loss (Details) Sheet http://www.clearwaterpaper.com/role/AccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Loss (Details) Details http://www.clearwaterpaper.com/role/AccumulatedOtherComprehensiveLossTables 71 false false R72.htm 9954522 - Disclosure - Earnings Per Share - Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) Sheet http://www.clearwaterpaper.com/role/EarningsPerShareShareReconciliationofNumberofCommonSharesUsedinCalculatingBasicandDilutedNetEarningsPerShareDetails Earnings Per Share - Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) Details 72 false false R73.htm 9954523 - Disclosure - Stockholders' Equity - Employee Plans Equity Based Compensation Expense (Details) Sheet http://www.clearwaterpaper.com/role/StockholdersEquityEmployeePlansEquityBasedCompensationExpenseDetails Stockholders' Equity - Employee Plans Equity Based Compensation Expense (Details) Details 73 false false R74.htm 9954524 - Disclosure - Stockholders' Equity - Summary of Status of Outstanding RSU Awards (Details) Sheet http://www.clearwaterpaper.com/role/StockholdersEquitySummaryofStatusofOutstandingRSUAwardsDetails Stockholders' Equity - Summary of Status of Outstanding RSU Awards (Details) Details 74 false false R75.htm 9954525 - Disclosure - Stockholders' Equity - Summary of Status of Outstanding Performance Share Awards (Details) Sheet http://www.clearwaterpaper.com/role/StockholdersEquitySummaryofStatusofOutstandingPerformanceShareAwardsDetails Stockholders' Equity - Summary of Status of Outstanding Performance Share Awards (Details) Details 75 false false R76.htm 9954526 - Disclosure - Stockholders' Equity - Additional Information (Details) Sheet http://www.clearwaterpaper.com/role/StockholdersEquityAdditionalInformationDetails Stockholders' Equity - Additional Information (Details) Details 76 false false R77.htm 9954527 - Disclosure - Commitments and Contingencies Commitments and Contingencies Additional Information (Details) Sheet http://www.clearwaterpaper.com/role/CommitmentsandContingenciesCommitmentsandContingenciesAdditionalInformationDetails Commitments and Contingencies Commitments and Contingencies Additional Information (Details) Details 77 false false R78.htm 9954528 - Disclosure - Segment Information - Reportable Segments Information (Details) Sheet http://www.clearwaterpaper.com/role/SegmentInformationReportableSegmentsInformationDetails Segment Information - Reportable Segments Information (Details) Details 78 false false R79.htm 9954529 - Disclosure - Subsequent Events (Details) Sheet http://www.clearwaterpaper.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.clearwaterpaper.com/role/SubsequentEvents 79 false false All Reports Book All Reports clw-20231231.htm clw-20231231.xsd clw-20231231_cal.xml clw-20231231_def.xml clw-20231231_lab.xml clw-20231231_pre.xml clw-20231231_g1.jpg clw-20231231_g2.jpg http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 true true