3.22.4 html 390 505 1 true 106 0 false 10 false false R1.htm 100000 - Document - Document and Entity Information Document Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DocumentDocumentAndEntityInformationDocument Document and Entity Information Document Cover 1 false false R2.htm 100010 - Statement - Consolidated Statements of Income Sheet http://www.ctg.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 2 false false R3.htm 100020 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 3 false false R4.htm 100030 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements of Comprehensive Income (Parenthetical) Statements 4 false false R5.htm 100040 - Statement - Consolidated Balance Sheets Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheets Consolidated Balance Sheets Statements 5 false false R6.htm 100050 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 6 false false R7.htm 100060 - Statement - Consolidated Statements of Cash Flows Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 100070 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.ctg.com/20221231/taxonomy/role/Role_StatementConsolidatedStatementsOfShareholdersEquity Consolidated Statements of Shareholders' Equity Statements 8 false false R9.htm 100080 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 100090 - Disclosure - Property, Equipment and Capitalized Software Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftware Property, Equipment and Capitalized Software Notes 10 false false R11.htm 100100 - Disclosure - Acquisitions Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitions Acquisitions Notes 11 false false R12.htm 100110 - Disclosure - Debt Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDebt Debt Notes 12 false false R13.htm 100120 - Disclosure - Income Taxes Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 13 false false R14.htm 100130 - Disclosure - Lease Commitments Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitments Lease Commitments Notes 14 false false R15.htm 100140 - Disclosure - Deferred Compensation Benefits Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefits Deferred Compensation Benefits Notes 15 false false R16.htm 100150 - Disclosure - Employee Benefits Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefits Employee Benefits Notes 16 false false R17.htm 100160 - Disclosure - Shareholders' Equity Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureShareholdersEquity Shareholders' Equity Notes 17 false false R18.htm 100170 - Disclosure - Equity-Based Compensation Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensation Equity-Based Compensation Notes 18 false false R19.htm 100180 - Disclosure - Significant Clients Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSignificantClients Significant Clients Notes 19 false false R20.htm 100190 - Disclosure - Contingencies Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureContingencies Contingencies Notes 20 false false R21.htm 100200 - Disclosure - Segments and Enterprise-Wide Disclosures Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosures Segments and Enterprise-Wide Disclosures Notes 21 false false R22.htm 100210 - Disclosure - Schedule II-Valuation and Qualifying Accounts Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts Schedule II-Valuation and Qualifying Accounts Notes 22 false false R23.htm 100220 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 23 false false R24.htm 100230 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 24 false false R25.htm 100240 - Disclosure - Property, Equipment and Capitalized Software (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftwareTables Property, Equipment and Capitalized Software (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftware 25 false false R26.htm 100250 - Disclosure - Acquisitions (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsTables Acquisitions (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitions 26 false false R27.htm 100260 - Disclosure - Income Taxes (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes 27 false false R28.htm 100270 - Disclosure - Lease Commitments (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitmentsTables Lease Commitments (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitments 28 false false R29.htm 100280 - Disclosure - Deferred Compensation Benefits (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsTables Deferred Compensation Benefits (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefits 29 false false R30.htm 100290 - Disclosure - Equity-Based Compensation (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationTables Equity-Based Compensation (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensation 30 false false R31.htm 100300 - Disclosure - Segments and Enterprise-Wide Disclosures (Tables) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosuresTables Segments and Enterprise-Wide Disclosures (Tables) Tables http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosures 31 false false R32.htm 100310 - Disclosure - Summary of Significant Accounting Policies - Basis of Presentation and Consolidation (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesBasisOfPresentationAndConsolidationDetails Summary of Significant Accounting Policies - Basis of Presentation and Consolidation (Details) Details 32 false false R33.htm 100320 - Disclosure - Summary of Significant Accounting Policies - Revenue by Vertical Market as Percentage of Total Revenue (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesRevenueByVerticalMarketAsPercentageOfTotalRevenueDetails Summary of Significant Accounting Policies - Revenue by Vertical Market as Percentage of Total Revenue (Details) Details 33 false false R34.htm 100330 - Disclosure - Summary of Significant Accounting Policies - Revenue by Contract Type (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesRevenueByContractTypeDetails Summary of Significant Accounting Policies - Revenue by Contract Type (Details) Details 34 false false R35.htm 100340 - Disclosure - Summary of Significant Accounting Policies - Schedule of Revenue by Geographic Location (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfRevenueByGeographicLocationDetails Summary of Significant Accounting Policies - Schedule of Revenue by Geographic Location (Details) Details 35 false false R36.htm 100350 - Disclosure - Summary of Significant Accounting Policies - Billable Expenses (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesBillableExpensesDetails Summary of Significant Accounting Policies - Billable Expenses (Details) Details 36 false false R37.htm 100360 - Disclosure - Summary of Significant Accounting Policies - Transaction Price Allocated to Remaining Performance Obligations (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTransactionPriceAllocatedToRemainingPerformanceObligationsDetails Summary of Significant Accounting Policies - Transaction Price Allocated to Remaining Performance Obligations (Details) Details 37 false false R38.htm 100370 - Disclosure - Summary of Significant Accounting Policies - Transaction Price Allocated to Remaining Performance Obligations (Details 1) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTransactionPriceAllocatedToRemainingPerformanceObligationsDetails1 Summary of Significant Accounting Policies - Transaction Price Allocated to Remaining Performance Obligations (Details 1) Details 38 false false R39.htm 100380 - Disclosure - Summary of Significant Accounting Policies - Fair Value (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesFairValueDetails Summary of Significant Accounting Policies - Fair Value (Details) Details 39 false false R40.htm 100390 - Disclosure - Summary of Significant Accounting Policies - Life Insurance Policies (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesLifeInsurancePoliciesDetails Summary of Significant Accounting Policies - Life Insurance Policies (Details) Details 40 false false R41.htm 100400 - Disclosure - Summary of Significant Accounting Policies - Cash and Cash Equivalents, and Cash Overdrafts (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesCashAndCashEquivalentsAndCashOverdraftsDetails Summary of Significant Accounting Policies - Cash and Cash Equivalents, and Cash Overdrafts (Details) Details 41 false false R42.htm 100410 - Disclosure - Summary of Significant Accounting Policies - Accounts Receivable Factoring (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAccountsReceivableFactoringDetails Summary of Significant Accounting Policies - Accounts Receivable Factoring (Details) Details 42 false false R43.htm 100420 - Disclosure - Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPropertyEquipmentAndCapitalizedSoftwareCostsDetails Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs (Details) Details 43 false false R44.htm 100430 - Disclosure - Summary of Significant Accounting Policies - Impairment of Long-lived assets and Long-lived assets to be disposed of (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesImpairmentOfLongLivedAssetsAndLongLivedAssetsToBeDisposedOfDetails Summary of Significant Accounting Policies - Impairment of Long-lived assets and Long-lived assets to be disposed of (Details) Details 44 false false R45.htm 100440 - Disclosure - Summary of Significant Accounting Policies - Segments (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesSegmentsDetails Summary of Significant Accounting Policies - Segments (Details) Details 45 false false R46.htm 100450 - Disclosure - Summary of Significant Accounting Policies - Goodwill (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesGoodwillDetails Summary of Significant Accounting Policies - Goodwill (Details) Details 46 false false R47.htm 100460 - Disclosure - Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfChangesInCarryingAmountOfGoodwillDetails Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Details) Details 47 false false R48.htm 100470 - Disclosure - Summary of Significant Accounting Policies - Summary of Acquired Intangible Assets (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfAcquiredIntangibleAssetsDetails Summary of Significant Accounting Policies - Summary of Acquired Intangible Assets (Details) Details 48 false false R49.htm 100480 - Disclosure - Summary of Significant Accounting Policies - Acquired Intangible Assets (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAcquiredIntangibleAssetsDetails Summary of Significant Accounting Policies - Acquired Intangible Assets (Details) Details 49 false false R50.htm 100490 - Disclosure - Summary of Significant Accounting Policies - Summary of Estimated Amortization Expense (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfEstimatedAmortizationExpenseDetails Summary of Significant Accounting Policies - Summary of Estimated Amortization Expense (Details) Details 50 false false R51.htm 100500 - Disclosure - Summary of Significant Accounting Policies - Income Taxes (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesIncomeTaxesDetails Summary of Significant Accounting Policies - Income Taxes (Details) Details 51 false false R52.htm 100510 - Disclosure - Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (EPS) (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesBasicAndDilutedEarningsPerShareEPSDetails Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (EPS) (Details) Details 52 false false R53.htm 100520 - Disclosure - Summary of Significant Accounting Policies - Net Income Per Share - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesNetIncomePerShareAdditionalInformationDetails Summary of Significant Accounting Policies - Net Income Per Share - Additional Information (Details) Details 53 false false R54.htm 100530 - Disclosure - Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfAccumulatedOtherComprehensiveLossDetails Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Details) Details 54 false false R55.htm 100540 - Disclosure - Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Parenthetical) (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfAccumulatedOtherComprehensiveLossParentheticalDetails Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Loss (Parenthetical) (Details) Details 55 false false R56.htm 100550 - Disclosure - Summary of Significant Accounting Policies - Schedule of Net Benefit Costs (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfNetBenefitCostsDetails Summary of Significant Accounting Policies - Schedule of Net Benefit Costs (Details) Details 56 false false R57.htm 100560 - Disclosure - Summary of Significant Accounting Policies - Guarantees (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesGuaranteesDetails Summary of Significant Accounting Policies - Guarantees (Details) Details 57 false false R58.htm 100570 - Disclosure - Property, Equipment and Capitalized Software Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/DisclosurePropertyEquipmentAndCapitalizedSoftwareAdditionalInformationDetails Property, Equipment and Capitalized Software Additional Information (Details) Details 58 false false R59.htm 100580 - Disclosure - Property, Equipment and Capitalized Software - Schedule of Property, Equipment and Capitalized Software (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftwareScheduleOfPropertyEquipmentAndCapitalizedSoftwareDetails Property, Equipment and Capitalized Software - Schedule of Property, Equipment and Capitalized Software (Details) Details 59 false false R60.htm 100590 - Disclosure - Property, Equipment and Capitalized Software - Useful Life (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftwareUsefulLifeDetails Property, Equipment and Capitalized Software - Useful Life (Details) Details 60 false false R61.htm 100600 - Disclosure - Property, Equipment and Capitalized Software - Schedule of Capitalized Software Costs (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftwareScheduleOfCapitalizedSoftwareCostsDetails Property, Equipment and Capitalized Software - Schedule of Capitalized Software Costs (Details) Details 61 false false R62.htm 100610 - Disclosure - Property, Equipment and Capitalized Software - Schedule of Amortization Expense and Accumulated Amortization (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosurePropertyEquipmentAndCapitalizedSoftwareScheduleOfAmortizationExpenseAndAccumulatedAmortizationDetails Property, Equipment and Capitalized Software - Schedule of Amortization Expense and Accumulated Amortization (Details) Details 62 false false R63.htm 100620 - Disclosure - Acquisitions - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsAdditionalInformationDetails Acquisitions - Additional Information (Details) Details 63 false false R64.htm 100630 - Disclosure - Acquisitions - Summary of Acquisition Date Fair Value of Consideration (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsSummaryOfAcquisitionDateFairValueOfConsiderationDetails Acquisitions - Summary of Acquisition Date Fair Value of Consideration (Details) Details 64 false false R65.htm 100640 - Disclosure - Acquisitions - Summary of Allocation of Aggregate Purchase Consideration to Fair Values of Assets Acquired and Liabilities Assumed (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsSummaryOfAllocationOfAggregatePurchaseConsiderationToFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetails Acquisitions - Summary of Allocation of Aggregate Purchase Consideration to Fair Values of Assets Acquired and Liabilities Assumed (Details) Details 65 false false R66.htm 100650 - Disclosure - Acquisitions - Summary of Intangible Assets Acquired (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureAcquisitionsSummaryOfIntangibleAssetsAcquiredDetails Acquisitions - Summary of Intangible Assets Acquired (Details) Details 66 false false R67.htm 100670 - Disclosure - Debt - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetails Debt - Additional Information (Details) Details 67 false false R68.htm 100680 - Disclosure - Income Taxes - Provision for Income Taxes (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesProvisionForIncomeTaxesDetails Income Taxes - Provision for Income Taxes (Details) Details 68 false false R69.htm 100690 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 69 false false R70.htm 100700 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 70 false false R71.htm 100720 - Disclosure - Lease Commitments - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitmentsAdditionalInformationDetails Lease Commitments - Additional Information (Details) Details 71 false false R72.htm 100730 - Disclosure - Lease Commitments - Summary of Lease Costs (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/DisclosureLeaseCommitmentsSummaryOfLeaseCostsDetails Lease Commitments - Summary of Lease Costs (Details) Details 72 false false R73.htm 100740 - Disclosure - Lease Commitments - Summary of Maturities of Lease Liabilities for Operating Liabilities (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitmentsSummaryOfMaturitiesOfLeaseLiabilitiesForOperatingLiabilitiesDetails Lease Commitments - Summary of Maturities of Lease Liabilities for Operating Liabilities (Details) Details 73 false false R74.htm 100750 - Disclosure - Lease Commitments - Summary of Weighted Average Remaining Lease Term, Discount Rate and Supplemental Cash Flow Information for All Operating Leases (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureLeaseCommitmentsSummaryOfWeightedAverageRemainingLeaseTermDiscountRateAndSupplementalCashFlowInformationForAllOperatingLeasesDetails Lease Commitments - Summary of Weighted Average Remaining Lease Term, Discount Rate and Supplemental Cash Flow Information for All Operating Leases (Details) Details 74 false false R75.htm 100760 - Disclosure - Deferred Compensation Benefits - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsAdditionalInformationDetails Deferred Compensation Benefits - Additional Information (Details) Details 75 false false R76.htm 100770 - Disclosure - Deferred Compensation Benefits - Schedule of Net Periodic Pension Cost (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsScheduleOfNetPeriodicPensionCostDetails Deferred Compensation Benefits - Schedule of Net Periodic Pension Cost (Details) Details 76 false false R77.htm 100790 - Disclosure - Deferred Compensation Benefits - Deferred Compensation Benefits Change in Benefit Obligation and Reconciliation of Fair Value (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsDeferredCompensationBenefitsChangeInBenefitObligationAndReconciliationOfFairValueDetails Deferred Compensation Benefits - Deferred Compensation Benefits Change in Benefit Obligation and Reconciliation of Fair Value (Details) Details 77 false false R78.htm 100800 - Disclosure - Deferred Compensation Benefits - Schedule of Accrued Benefit Cost (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsScheduleOfAccruedBenefitCostDetails Deferred Compensation Benefits - Schedule of Accrued Benefit Cost (Details) Details 78 false false R79.htm 100810 - Disclosure - Deferred Compensation Benefits - Deferred Compensation Benefits Anticipated Benefit Payments (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureDeferredCompensationBenefitsDeferredCompensationBenefitsAnticipatedBenefitPaymentsDetails Deferred Compensation Benefits - Deferred Compensation Benefits Anticipated Benefit Payments (Details) Details 79 false false R80.htm 100820 - Disclosure - Employee Benefits - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEmployeeBenefitsAdditionalInformationDetails Employee Benefits - Additional Information (Details) Details 80 false false R81.htm 100830 - Disclosure - Shareholders' Equity - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureShareholdersEquityAdditionalInformationDetails Shareholders' Equity - Additional Information (Details) Details 81 false false R82.htm 100840 - Disclosure - Equity-Based Compensation - Summary of Equity-Based Compensation Expense, the Corresponding Tax Benefit and Net Equity-Based Compensation Expense (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfEquityBasedCompensationExpenseCorrespondingTaxBenefitAndNetEquityBasedCompensationExpenseDetails Equity-Based Compensation - Summary of Equity-Based Compensation Expense, the Corresponding Tax Benefit and Net Equity-Based Compensation Expense (Details) Details 82 false false R83.htm 100850 - Disclosure - Equity-Based Compensation - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationAdditionalInformationDetails Equity-Based Compensation - Additional Information (Details) Details 83 false false R84.htm 100860 - Disclosure - Equity-Based Compensation - Summary of Weighted-Average Assumptions Used to Estimate Fair Value of Options (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfWeightedAverageAssumptionsUsedToEstimateFairValueOfOptionsDetails Equity-Based Compensation - Summary of Weighted-Average Assumptions Used to Estimate Fair Value of Options (Details) Details 84 false false R85.htm 100870 - Disclosure - Equity-Based Compensation - Summary of Stock Option Activity Under the 2020 Plan, 2010 Plan and Equity Plan (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfStockOptionActivityUnder2020Plan2010PlanAndEquityPlanDetails Equity-Based Compensation - Summary of Stock Option Activity Under the 2020 Plan, 2010 Plan and Equity Plan (Details) Details 85 false false R86.htm 100880 - Disclosure - Equity-Based Compensation - Summary of Restricted Stock Activity Under the 2010 Plan, Equity Plan and the 1991 Restricted Stock Plan (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfRestrictedStockActivityUnder2010PlanEquityPlanAnd1991RestrictedStockPlanDetails Equity-Based Compensation - Summary of Restricted Stock Activity Under the 2010 Plan, Equity Plan and the 1991 Restricted Stock Plan (Details) Details 86 false false R87.htm 100890 - Disclosure - Equity-Based Compensation - Summary of Stock Options Outstanding for the 2020 Plan, 2010 Plan and Equity Plan (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfStockOptionsOutstandingFor2020Plan2010PlanAndEquityPlanDetails Equity-Based Compensation - Summary of Stock Options Outstanding for the 2020 Plan, 2010 Plan and Equity Plan (Details) Details 87 false false R88.htm 100900 - Disclosure - Equity-Based Compensation - Summary of Stock Options that are Exercisable for the 2020 Plan, 2010 Plan and the Equity Plan (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfStockOptionsThatAreExercisableFor2020Plan2010PlanAndEquityPlanDetails Equity-Based Compensation - Summary of Stock Options that are Exercisable for the 2020 Plan, 2010 Plan and the Equity Plan (Details) Details 88 false false R89.htm 100910 - Disclosure - Significant Clients - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSignificantClientsAdditionalInformationDetails Significant Clients - Additional Information (Details) Details 89 false false R90.htm 100920 - Disclosure - Segments and Enterprise-Wide Disclosures - Additional Information (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosuresAdditionalInformationDetails Segments and Enterprise-Wide Disclosures - Additional Information (Details) Details 90 false false R91.htm 100930 - Disclosure - Segments and Enterprise-Wide Disclosures - Schedule of Operating Segments (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosuresScheduleOfOperatingSegmentsDetails Segments and Enterprise-Wide Disclosures - Schedule of Operating Segments (Details) Details 91 false false R92.htm 100940 - Disclosure - Segments and Enterprise-Wide Disclosures - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureSegmentsAndEnterpriseWideDisclosuresScheduleOfRevenueFromExternalCustomersAndLongLivedAssetsByGeographicalAreasDetails Segments and Enterprise-Wide Disclosures - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) Details 92 false false R93.htm 100950 - Disclosure - Schedule II-Valuation and Qualifying Accounts - (Details) Sheet http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccountsDetails Schedule II-Valuation and Qualifying Accounts - (Details) Details http://www.ctg.com/20221231/taxonomy/role/Role_DisclosureScheduleIIValuationAndQualifyingAccounts 93 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 14 fact(s) appearing in ix:hidden were eligible for transformation: ctg:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfInstallments, dei:CurrentFiscalYearEndDate, us-gaap:PropertyPlantAndEquipmentUsefulLife, us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1, us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1, us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod - ctg-20221231.htm 8 ctg-20221231.htm ctg-20221231.xsd ctg-20221231_cal.xml ctg-20221231_def.xml ctg-20221231_lab.xml ctg-20221231_pre.xml ctg-ex21.htm ctg-ex23.htm ctg-ex31_1.htm ctg-ex31_2.htm ctg-ex32.htm ctg-ex3_2.htm img137873428_0.jpg http://fasb.org/srt/2022 http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true