2.4.0.6 Html 348 424 1 true 77 0 false 8 false false R1.htm 0001000 - Document - Document and Entity Information Document Sheet http://duffandphelps.com/role/DocumentAndEntityInformationDocument Document and Entity Information Document false false R2.htm 1001000 - Statement - Consolidated Statements of Operations Sheet http://duffandphelps.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations false false R3.htm 1001001 - Statement - Consolidated Statements of Operations Consolidated Statements of Income Parentheticals Sheet http://duffandphelps.com/role/ConsolidatedStatementsOfOperationsConsolidatedStatementsOfIncomeParentheticals Consolidated Statements of Operations Consolidated Statements of Income Parentheticals false false R4.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://duffandphelps.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income true false R5.htm 1004000 - Statement - Consolidated Balance Sheets Sheet http://duffandphelps.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets false false R6.htm 1004001 - Statement - Consolidated Balance Sheets Constolidated Balance Sheets Parentheticals Sheet http://duffandphelps.com/role/ConsolidatedBalanceSheetsConstolidatedBalanceSheetsParentheticals Consolidated Balance Sheets Constolidated Balance Sheets Parentheticals false false R7.htm 1006000 - Statement - Consolidated Statements of Cash Flows Sheet http://duffandphelps.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R8.htm 1007000 - Statement - Consolidated Statement of Stockholders' Equity Statement Sheet http://duffandphelps.com/role/ConsolidatedStatementOfStockholdersEquityStatement Consolidated Statement of Stockholders' Equity Statement false false R9.htm 2101100 - Disclosure - Description of Business Sheet http://duffandphelps.com/role/DescriptionOfBusiness Description of Business false false R10.htm 2104100 - Disclosure - Basis of Presentation Sheet http://duffandphelps.com/role/BasisOfPresentation Basis of Presentation false false R11.htm 2107100 - Disclosure - Noncontrolling Interest Sheet http://duffandphelps.com/role/NoncontrollingInterest Noncontrolling Interest false false R12.htm 2110100 - Disclosure - Acquisitions Sheet http://duffandphelps.com/role/Acquisitions Acquisitions false false R13.htm 2113100 - Disclosure - Earnings per Share Sheet http://duffandphelps.com/role/EarningsPerShare Earnings per Share false false R14.htm 2116100 - Disclosure - Fair Value Measurements Sheet http://duffandphelps.com/role/FairValueMeasurements Fair Value Measurements false false R15.htm 2119100 - Disclosure - Property and Equipment Sheet http://duffandphelps.com/role/PropertyAndEquipment Property and Equipment false false R16.htm 2122100 - Disclosure - Goodwill and Intangible Assets Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssets Goodwill and Intangible Assets false false R17.htm 2125100 - Disclosure - Long-Term Debt Sheet http://duffandphelps.com/role/LongTermDebt Long-Term Debt false false R18.htm 2128100 - Disclosure - Other Long-Term Liabilities Sheet http://duffandphelps.com/role/OtherLongTermLiabilities Other Long-Term Liabilities false false R19.htm 2131100 - Disclosure - Equity Based Compensation Sheet http://duffandphelps.com/role/EquityBasedCompensation Equity Based Compensation false false R20.htm 2134100 - Disclosure - Capital Structure Sheet http://duffandphelps.com/role/CapitalStructure Capital Structure false false R21.htm 2139100 - Disclosure - Income Taxes Sheet http://duffandphelps.com/role/IncomeTaxes Income Taxes false false R22.htm 2140100 - Disclosure - Commitments and Contingencies Sheet http://duffandphelps.com/role/CommitmentsAndContingencies Commitments and Contingencies false false R23.htm 2141100 - Disclosure - Restructuring Charges Sheet http://duffandphelps.com/role/RestructuringCharges Restructuring Charges false false R24.htm 2142100 - Disclosure - Charge from Realignment of Senior Management Sheet http://duffandphelps.com/role/ChargeFromRealignmentOfSeniorManagement Charge from Realignment of Senior Management false false R25.htm 2143100 - Disclosure - Employee Benefit Plans Sheet http://duffandphelps.com/role/EmployeeBenefitPlans Employee Benefit Plans false false R26.htm 2144100 - Disclosure - Segment Information Sheet http://duffandphelps.com/role/SegmentInformation Segment Information false false R27.htm 2145100 - Disclosure - Related Party Transactions Sheet http://duffandphelps.com/role/RelatedPartyTransactions Related Party Transactions false false R28.htm 2146100 - Disclosure - Regulated Subsidiaries Sheet http://duffandphelps.com/role/RegulatedSubsidiaries Regulated Subsidiaries false false R29.htm 2147100 - Disclosure - Selected Quarterly Data (Unaudited) Sheet http://duffandphelps.com/role/SelectedQuarterlyDataUnaudited Selected Quarterly Data (Unaudited) false false R30.htm 2148100 - Disclosure - Subsequent Events Sheet http://duffandphelps.com/role/SubsequentEvents Subsequent Events false false R31.htm 2149100 - Schedule - Valuation and Qualifying Accounts Sheet http://duffandphelps.com/role/ValuationAndQualifyingAccounts Valuation and Qualifying Accounts false false R32.htm 2204201 - Disclosure - Basis of Presentation Level 2 (Policies) Sheet http://duffandphelps.com/role/BasisOfPresentationLevel2Policies Basis of Presentation Level 2 (Policies) false false R33.htm 2304302 - Disclosure - Basis of Presentation (Tables) Sheet http://duffandphelps.com/role/BasisOfPresentationTables Basis of Presentation (Tables) false false R34.htm 2307301 - Disclosure - Noncontrolling Interest (Tables) Sheet http://duffandphelps.com/role/NoncontrollingInterestTables Noncontrolling Interest (Tables) false false R35.htm 2310301 - Disclosure - Acquisitions (Tables) Sheet http://duffandphelps.com/role/AcquisitionsTables Acquisitions (Tables) false false R36.htm 2313301 - Disclosure - Earnings per Share (Tables) Sheet http://duffandphelps.com/role/EarningsPerShareTables Earnings per Share (Tables) false false R37.htm 2316301 - Disclosure - Fair Value Measurements (Tables) Sheet http://duffandphelps.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) false false R38.htm 2319301 - Disclosure - Property and Equipment (Tables) Sheet http://duffandphelps.com/role/PropertyAndEquipmentTables Property and Equipment (Tables) false false R39.htm 2322301 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsTables Goodwill and Intangible Assets (Tables) false false R40.htm 2322302 - Disclosure - Goodwill and Intangible Assets Future Amortization Expense (Tables) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsFutureAmortizationExpenseTables Goodwill and Intangible Assets Future Amortization Expense (Tables) false false R41.htm 2322303 - Disclosure - Goodwill and Intangible Assets Schedule of Intangible Assets (Tables) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsTables Goodwill and Intangible Assets Schedule of Intangible Assets (Tables) false false R42.htm 2328301 - Disclosure - Other Long-Term Liabilities (Tables) Sheet http://duffandphelps.com/role/OtherLongTermLiabilitiesTables Other Long-Term Liabilities (Tables) false false R43.htm 2331301 - Disclosure - Equity Based Compensation (Tables) Sheet http://duffandphelps.com/role/EquityBasedCompensationTables Equity Based Compensation (Tables) false false R44.htm 2339301 - Disclosure - Income Taxes (Tables) Sheet http://duffandphelps.com/role/IncomeTaxesTables Income Taxes (Tables) false false R45.htm 2340301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://duffandphelps.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) false false R46.htm 2341301 - Disclosure - Restructuring Charges (Tables) Sheet http://duffandphelps.com/role/RestructuringChargesTables Restructuring Charges (Tables) false false R47.htm 2343301 - Disclosure - Employee Benefit Plans (Tables) Sheet http://duffandphelps.com/role/EmployeeBenefitPlansTables Employee Benefit Plans (Tables) false false R48.htm 2344301 - Disclosure - Segment Information (Tables) Sheet http://duffandphelps.com/role/SegmentInformationTables Segment Information (Tables) false false R49.htm 2345301 - Disclosure - Related Party Transactions (Tables) Sheet http://duffandphelps.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) false false R50.htm 2347301 - Disclosure - Selected Quarterly Data (Unaudited) (Tables) Sheet http://duffandphelps.com/role/SelectedQuarterlyDataUnauditedTables Selected Quarterly Data (Unaudited) (Tables) false false R51.htm 2401402 - Disclosure - Description of Business (Details) Sheet http://duffandphelps.com/role/DescriptionOfBusinessDetails Description of Business (Details) false false R52.htm 2404403 - Disclosure - Basis of Presentation Follow On Offering (Details) Sheet http://duffandphelps.com/role/BasisOfPresentationFollowOnOfferingDetails Basis of Presentation Follow On Offering (Details) false false R53.htm 2404404 - Disclosure - Basis of Presentation Summary of Bad Debt Expense (Details) Sheet http://duffandphelps.com/role/BasisOfPresentationSummaryOfBadDebtExpenseDetails Basis of Presentation Summary of Bad Debt Expense (Details) false false R54.htm 2404405 - Disclosure - Basis of Presentation Entry into a Definitive Merger Agreement (Details) Sheet http://duffandphelps.com/role/BasisOfPresentationEntryIntoDefinitiveMergerAgreementDetails Basis of Presentation Entry into a Definitive Merger Agreement (Details) false false R55.htm 2407402 - Disclosure - Noncontrolling Interest Noncontrolling Interest Table (Details) Sheet http://duffandphelps.com/role/NoncontrollingInterestNoncontrollingInterestTableDetails Noncontrolling Interest Noncontrolling Interest Table (Details) false false R56.htm 2407403 - Disclosure - Noncontrolling Interest Reconciliation of Income Before Taxes to Net Income (Details) Sheet http://duffandphelps.com/role/NoncontrollingInterestReconciliationOfIncomeBeforeTaxesToNetIncomeDetails Noncontrolling Interest Reconciliation of Income Before Taxes to Net Income (Details) false false R57.htm 2407404 - Disclosure - Noncontrolling Interest Distribution and Other Payments to Noncontrolling Unitholders (Details) Sheet http://duffandphelps.com/role/NoncontrollingInterestDistributionAndOtherPaymentsToNoncontrollingUnitholdersDetails Noncontrolling Interest Distribution and Other Payments to Noncontrolling Unitholders (Details) false false R58.htm 2410402 - Disclosure - Acquisitions Acquisitions (Details) Sheet http://duffandphelps.com/role/AcquisitionsAcquisitionsDetails Acquisitions Acquisitions (Details) false false R59.htm 2413402 - Disclosure - Earnings per Share Earnings Per Share Two Class Method (Details) Sheet http://duffandphelps.com/role/EarningsPerShareEarningsPerShareTwoClassMethodDetails Earnings per Share Earnings Per Share Two Class Method (Details) false false R60.htm 2413403 - Disclosure - Earnings per Share Antidilution Options (Details) Sheet http://duffandphelps.com/role/EarningsPerShareAntidilutionOptionsDetails Earnings per Share Antidilution Options (Details) false false R61.htm 2413404 - Disclosure - Earnings per Share Performance Shares Excluded (Details) Sheet http://duffandphelps.com/role/EarningsPerSharePerformanceSharesExcludedDetails Earnings per Share Performance Shares Excluded (Details) false false R62.htm 2413405 - Disclosure - Earnings per Share Weighted Average Class B Shares and New Class A Units Excluded (Details) Sheet http://duffandphelps.com/role/EarningsPerShareWeightedAverageClassBSharesAndNewClassUnitsExcludedDetails Earnings per Share Weighted Average Class B Shares and New Class A Units Excluded (Details) false false R63.htm 2416402 - Disclosure - Fair Value Measurements Fair Value (Details) Sheet http://duffandphelps.com/role/FairValueMeasurementsFairValueDetails Fair Value Measurements Fair Value (Details) false false R64.htm 2416403 - Disclosure - Fair Value Measurements Changes in Fair Value Level 3 (Details) Sheet http://duffandphelps.com/role/FairValueMeasurementsChangesInFairValueLevel3Details Fair Value Measurements Changes in Fair Value Level 3 (Details) false false R65.htm 2416404 - Disclosure - Fair Value Measurements Maximum Remaining Potential Contingent Considertion (Details) Sheet http://duffandphelps.com/role/FairValueMeasurementsMaximumRemainingPotentialContingentConsidertionDetails Fair Value Measurements Maximum Remaining Potential Contingent Considertion (Details) false false R66.htm 2419403 - Disclosure - Property and Equipment Property and Equipment (Details) Sheet http://duffandphelps.com/role/PropertyAndEquipmentPropertyAndEquipmentDetails Property and Equipment Property and Equipment (Details) false false R67.htm 2422404 - Disclosure - Goodwill and Intangible Assets (Details) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsDetails Goodwill and Intangible Assets (Details) false false R68.htm 2422405 - Disclosure - Goodwill and Intangible Assets Amortization Expense (Details) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsAmortizationExpenseDetails Goodwill and Intangible Assets Amortization Expense (Details) false false R69.htm 2422406 - Disclosure - Goodwill and Intangible Assets Schedule of Expected Amortization Expense (Details) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsScheduleOfExpectedAmortizationExpenseDetails Goodwill and Intangible Assets Schedule of Expected Amortization Expense (Details) false false R70.htm 2422407 - Disclosure - Goodwill and Intangible Assets Schedule of Intangible Assets (Details) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsDetails Goodwill and Intangible Assets Schedule of Intangible Assets (Details) false false R71.htm 2422408 - Disclosure - Goodwill and Intangible Assets Amortization Policy (Details) Sheet http://duffandphelps.com/role/GoodwillAndIntangibleAssetsAmortizationPolicyDetails Goodwill and Intangible Assets Amortization Policy (Details) false false R72.htm 2425402 - Disclosure - Long-Term Debt (Details) Sheet http://duffandphelps.com/role/LongTermDebtDetails Long-Term Debt (Details) false false R73.htm 2428402 - Disclosure - Other Long-Term Liabilities (Details) Sheet http://duffandphelps.com/role/OtherLongTermLiabilitiesDetails Other Long-Term Liabilities (Details) false false R74.htm 2431402 - Disclosure - Equity Based Compensation Equity-Based Compensation (Details) Sheet http://duffandphelps.com/role/EquityBasedCompensationEquityBasedCompensationDetails Equity Based Compensation Equity-Based Compensation (Details) false false R75.htm 2431403 - Disclosure - Equity Based Compensation Legacy Units (Details) Sheet http://duffandphelps.com/role/EquityBasedCompensationLegacyUnitsDetails Equity Based Compensation Legacy Units (Details) false false R76.htm 2431404 - Disclosure - Equity Based Compensation Options (Details) Sheet http://duffandphelps.com/role/EquityBasedCompensationOptionsDetails Equity Based Compensation Options (Details) false false R77.htm 2431405 - Disclosure - Equity Based Compensation Restricted Stock and Performance Based Awards (Details) Sheet http://duffandphelps.com/role/EquityBasedCompensationRestrictedStockAndPerformanceBasedAwardsDetails Equity Based Compensation Restricted Stock and Performance Based Awards (Details) false false R78.htm 2431406 - Disclosure - Equity Based Compensation Other (Details) Sheet http://duffandphelps.com/role/EquityBasedCompensationOtherDetails Equity Based Compensation Other (Details) false false R79.htm 2434402 - Disclosure - Capital Structure (Details) Sheet http://duffandphelps.com/role/CapitalStructureDetails Capital Structure (Details) false false R80.htm 2439402 - Disclosure - Income Taxes Income Tax Contingency (Details) Sheet http://duffandphelps.com/role/IncomeTaxesIncomeTaxContingencyDetails Income Taxes Income Tax Contingency (Details) false false R81.htm 2439404 - Disclosure - Income Taxes Components of Income Tax Expense (Details) Sheet http://duffandphelps.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseDetails Income Taxes Components of Income Tax Expense (Details) false false R82.htm 2439405 - Disclosure - Income Taxes Reconciliation of Effective Income Tax Rate (Details) Sheet http://duffandphelps.com/role/IncomeTaxesReconciliationOfEffectiveIncomeTaxRateDetails Income Taxes Reconciliation of Effective Income Tax Rate (Details) false false R83.htm 2439406 - Disclosure - Income Taxes Income Taxes Payable (Details) Sheet http://duffandphelps.com/role/IncomeTaxesIncomeTaxesPayableDetails Income Taxes Income Taxes Payable (Details) false false R84.htm 2439407 - Disclosure - Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://duffandphelps.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) false false R85.htm 2440402 - Disclosure - Commitments and Contingencies (Details) Sheet http://duffandphelps.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) false false R86.htm 2440403 - Disclosure - Commitments and Contingencies Future minimum lease payments (Details) Sheet http://duffandphelps.com/role/CommitmentsAndContingenciesFutureMinimumLeasePaymentsDetails Commitments and Contingencies Future minimum lease payments (Details) false false R87.htm 2441402 - Disclosure - Restructuring Charges Restructuring Charges (Details) Sheet http://duffandphelps.com/role/RestructuringChargesRestructuringChargesDetails Restructuring Charges Restructuring Charges (Details) false false R88.htm 2442402 - Disclosure - Charge from Realignment of Senior Management (Details) Sheet http://duffandphelps.com/role/ChargeFromRealignmentOfSeniorManagementDetails Charge from Realignment of Senior Management (Details) false false R89.htm 2443402 - Disclosure - Employee Benefit Plans (Details) Sheet http://duffandphelps.com/role/EmployeeBenefitPlansDetails Employee Benefit Plans (Details) false false R90.htm 2444402 - Disclosure - Segment Information Number of Segments (Details) Sheet http://duffandphelps.com/role/SegmentInformationNumberOfSegmentsDetails Segment Information Number of Segments (Details) false false R91.htm 2444403 - Disclosure - Segment Information Revenue by Segment (Details) Sheet http://duffandphelps.com/role/SegmentInformationRevenueBySegmentDetails Segment Information Revenue by Segment (Details) false false R92.htm 2444404 - Disclosure - Segment Information Revenue by Geographic Area (Details) Sheet http://duffandphelps.com/role/SegmentInformationRevenueByGeographicAreaDetails Segment Information Revenue by Geographic Area (Details) false false R93.htm 2445402 - Disclosure - Related Party Transactions (Details) Sheet http://duffandphelps.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) false false R94.htm 2446402 - Disclosure - Regulated Subsidiaries (Details) Sheet http://duffandphelps.com/role/RegulatedSubsidiariesDetails Regulated Subsidiaries (Details) false false R95.htm 2447402 - Disclosure - Selected Quarterly Data (Unaudited) (Details) Sheet http://duffandphelps.com/role/SelectedQuarterlyDataUnauditedDetails Selected Quarterly Data (Unaudited) (Details) false false R96.htm 2448402 - Disclosure - Subsequent Events (Details) Sheet http://duffandphelps.com/role/SubsequentEventsDetails Subsequent Events (Details) false false R97.htm 2449402 - Schedule - Valuation and Qualifying Accounts (Details) Sheet http://duffandphelps.com/role/ValuationAndQualifyingAccountsDetails Valuation and Qualifying Accounts (Details) false false All Reports Book All Reports Element duf_StockSoldByAffiliatesValuePerShare had a mix of decimals attribute values: 0 2. Element us-gaap_CommonStockParOrStatedValuePerShare had a mix of decimals attribute values: 2 4. Process Flow-Through: 1001000 - Statement - Consolidated Statements of Operations Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 1001001 - Statement - Consolidated Statements of Operations Consolidated Statements of Income Parentheticals Process Flow-Through: 1003000 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: 1004000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 1004001 - Statement - Consolidated Balance Sheets Constolidated Balance Sheets Parentheticals Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 1006000 - Statement - Consolidated Statements of Cash Flows duf-20121231.xml duf-20121231.xsd duf-20121231_cal.xml duf-20121231_def.xml duf-20121231_lab.xml duf-20121231_pre.xml true true