Property and Equipment [Abstract]
Property and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment [Table Text Block]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Noncontrolling Interest [Abstract]
Reconciliation of Income Before Taxes to Net Income [Table]
Reconciliation of Income Before Taxes to Net Income [Table]
Reconciliation of Income Before Taxes to Net Income [Table]
Statement, Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Reconciliation of Income Before Taxes to Net Income [Line Items]
Reconciliation of Income Before Taxes to Net Income [Line Items]
Reconciliation of Income Before Taxes to Net Income [Line Items]
Income before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Provision for Income Taxes for Entities Other Than DPC
Provision for Income Taxes for Entities Other Than DPC
Provision for Income Taxes for Entities Other Than DPC
Income Before Taxes As Adjusted
Income Before Taxes As Adjusted
Income Before Taxes As Adjusted
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owner
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners, Duration
Net income attributable to noncontrolling interest
Net Income (Loss) Attributable to Noncontrolling Interest
Income Before Taxes, As Adjusted, Attributable to Parent
Income Before Taxes, As Adjusted, Attributable to Parent
Income Before Taxes, As Adjusted, Attributable to Parent
Provision for Income Taxes Attributable to Parent
Provision for Income Taxes Attributable to Parent
Provision for Income Taxes Attributable to Parent
Net income attributable to Duff & Phelps Corporation
Net Income (Loss) Attributable to Parent
Provision for income taxes
Income Tax Expense (Benefit)
Ownership of New Class A Units [Table Text Block]
Ownership of New Class A Units [Table Text Block]
Ownership of New Class A Units [Table Text Block]
Noncontrolling Interest Reconciliation of Net Income [Table Text Block]
Noncontrolling Interest Reconciliation of Net Income [Table Text Block]
Noncontrolling Interest Reconciliation of Net Income [Table Text Block]
Distributions to Noncontrolling Unitholders [Table Text Block]
Distributions to Noncontrolling Unitholders [Table Text Block]
Distributions to Noncontrolling Unitholders [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain]
Compensation and benefits [Member]
Compensation and benefits [Member]
Compensation and Benefits [Member]
Acquisition retention expenses [Member]
Acquisition retention expenses [Member]
Acquisition Retention Expenses [Member]
Selling, general and administrative [Member]
Selling, General and Administrative Expenses [Member]
Award Type
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Equity-based compensation from Legacy Units and IPO Options [Member]
Equity-based compensation from Legacy Units and IPO Options [Member]
Share-Based Compensation from Legacy Units and IPO Options [Member]
Equity-based compensation from Ongoing RSAs [Member]
Equity-based compensation from Ongoing RSAs [Member]
Share-Based Compensation from Ongoing RSAs [Member]
Equity-Based Compensation [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation
Allocated Share-based Compensation Expense
Schedule of Expected Amortization Expense [Table Text Block]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Parentheticals [Abstract]
Parentheticals [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
Distributions and Other Payments to Noncontrolling Unitholders [Table]
Distributions and Other Payments to Noncontrolling Unitholders [Table]
Distributions and Other Payments to Noncontrolling Unitholders [Table]
Distributions and Other Payments to Noncontrolling Unitholders [Line Items]
Distributions and Other Payments to Noncontrolling Unitholders [Line Items]
Distributions and Other Payments to Noncontrolling Unitholders [Line Items]
Distributions for taxes
Distributions for Taxes to Noncontrolling Unitholders
Distributions for Taxes to Noncontrolling Unitholders
Other distributions
Other Distributions to Noncontrolling Unitholders
Other Distributions to Noncontrolling Unitholders
Payments Pursuant to the Tax Receivable Agreement
Payments Pursuant to the Tax Receivable Agreement
Payments Pursuant to the Tax Receivable Agreement
Distributions and other payments to noncontrolling unitholders, including TRA
Distributions and other payments to noncontrolling unitholders, including TRA
Distributions and other payments to noncontrolling unitholders, including TRA
Tax Distribution Rate
Tax Distribution Rate
Tax Distribution Rate
TRA Savings Paid to Noncontrolling Unitholders
TRA Savings Paid to Noncontrolling Unitholders
TRA Savings Paid to Noncontrolling Unitholders
Noncontrolling Interest Liability (Current and Non-Current)
Due to Noncontrolling Unitholders, Current and Non-Current
Noncontrolling Interests Liability (Current and Non-Current)
Due to noncontrolling unitholders, current portion
Due to noncontrolling unitholders, current portion
Due to noncontrolling unitholders, current portion
Number of Years TRA Payments Expected to be Mad
Number of Years TRA Payments Expected to be Made
Number of Years TRA Payments Expected to be Made
Capital Structure [Abstract]
Capital Structure [Abstract]
Stockholders' Equity Note Disclosure [Text Block]
Stockholders' Equity Note Disclosure [Text Block]
Schedule of Amortization Expense [Table]
Schedule of Amortization Expense [Table]
Schedule of Amortization Expense [Table]
Schedule of Amortization Expense [Line Items]
Schedule of Amortization Expense [Line Items]
[Line Items] for Schedule of Amortization Expense [Table]
Amortization of Intangible Assets
Amortization of Intangible Assets
Charge from impairment of certain intangible assets
Impairment of Intangible Assets, Finite-lived
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]
Income Tax Disclosure [Abstract]
Open Periods Subject to Examination [Table]
Income Tax Examination [Table]
Income Tax Examination [Line Items]
Income Tax Examination [Line Items]
Income Tax Examination, Description
Income Tax Examination, Description
Regulated Subsidiaries [Abstract]
Regulated Subsidiaries [Abstract]
Property and Equipment Disclosure [Text Block]
Property, Plant and Equipment Disclosure [Text Block]
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]
Long-term Debt [Text Block]
Description of Business [Abstract]
Description of Business [Abstract]
Schedule of Units Exchanged for Shares of Class A Common Stock [Table]
Schedule of Units Exchanged for Shares of Class A Common Stock [Table]
Schedule of Units Exchanged for Shares of Class A Common Stock [Table]
Equity Components [Axis]
Equity Components [Axis]
Total Stockholders Equity
Equity Component [Domain]
Common Stock Class A [Member]
Common Class A [Member]
Schedule of Units Exchanged for Shares of Class A Common Stock [Line Items]
Schedule of Units Exchanged for Shares of Class A Common Stock [Line Items]
[Line Items] for Schedule of Units Exchanged for Shares of Class A Common Stock [Table]
Exchange of New Class A Units to shares of Class A common stock, shares
Conversion of Stock, Shares Converted
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts Disclosure [Table]
Valuation and Qualifying Accounts Disclosure [Table]
Valuation Allowances and Reserves Type [Axis]
Valuation Allowances and Reserves Type [Axis]
Valuation Allowances and Reserves [Domain]
Valuation Allowances and Reserves [Domain]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Nature of Operations [Text Block]
Subsequent Events [Abstract]
Subsequent Event [Table]
Subsequent Event [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Dividend Declared [Member]
Dividend Declared [Member]
Declaration of Quarterly Dividend [Line Items]
Subsequent Event [Line Items]
Dividends payable, date declared
Dividends Payable, Date Declared
Dividends payable, date to be paid
Dividends Payable, Date to be Paid
Dividends payable, record date
Dividends Payable, Date of Record
Cash dividends declared per common share
Common Stock, Dividends, Per Share, Declared
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]
Consolidation, Policy [Policy Text Block]
Use of Estimates, Policy [Policy Text Block]
Use of Estimates, Policy [Policy Text Block]
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and Cash Equivalents, Policy [Policy Text Block]
Revenue Recognition, Policy [Policy Text Block]
Revenue Recognition, Policy [Policy Text Block]
Receivables, Policy [Policy Text Block]
Receivables, Policy [Policy Text Block]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment, Policy [Policy Text Block]
Goodwill and Intangible Assets, Policy [Policy Text Block]
Goodwill and Intangible Assets, Policy [Policy Text Block]
Business Combinations Policy [Policy Text Block]
Business Combinations Policy [Policy Text Block]
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments, Policy [Policy Text Block]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Comprehensive Income, Policy [Policy Text Block]
Comprehensive Income, Policy [Policy Text Block]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Internal Use Software, Policy [Policy Text Block]
Internal Use Software, Policy [Policy Text Block]
Income Tax, Policy [Policy Text Block]
Income Tax, Policy [Policy Text Block]
Leases [Policy Text Block]
Leases [Policy Text Block]
Leases [Policy Text Block]
Dividends [Policy Text Block]
Dividends [Policy Text Block]
Dividends [Policy Text Block]
Repurchases of Common Stock Policy [Policy Text Block]
Repurchase of Common Stock Policy [Policy Text Block]
Repurchases of Common Stock Policy [Policy Text Block]
Segment Reporting, Policy [Policy Text Block]
Segment Reporting, Policy [Policy Text Block]
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Duff & Phelps Corporation
Undistributed Earnings Allocated to Participating Securities
Undistributed Earnings Allocated to Participating Securities
Earnings Available for Common Stock
Earnings Available for Common Stock
Earnings Available for Common Stock
Earnings Per Share, Denominator, Basic [Abstract]
Earnings Per Share, Denominator, Basic [Abstract]
Earnings Per Share, Denominator, Basic [Abstract]
Weighted average shares of Class A common stock outstanding, basic
Weighted Average Number of Shares Outstanding, Basic
Earnings Per Share, Denominator, Diluted [Abstract]
Earnings Per Share, Denominator, Diluted [Abstract]
Earnings Per Share, Denominator, Diluted [Abstract]
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted average shares of Class A common stock outstanding, diluted
Weighted Average Number of Shares Outstanding, Diluted
Earnings per share, basic
Earnings Per Share, Basic
Earnings per share, diluted
Earnings Per Share, Diluted
Employee Benefit Plans [Abstract]
Employee Benefit Plans [Abstract]
Employee Benefit Plans [Table]
Employee Benefit Plans [Table]
Employee Benefit Plans [Table]
Employee Benefit Plans [Line Items]
Employee Benefit Plans [Line Items]
Employee Benefit Plans [Line Items]
Deferred Compensation Arrangements, Overall, Description
Deferred Compensation Arrangements, Overall, Description
Description of Defined Contribution Pension and Other Postretirement Plans
Description of Defined Contribution Pension and Other Postretirement Plans
Defined Contribution Plan, Employer Discretionary Contribution Amount
Defined Contribution Plan, Employer Discretionary Contribution Amount
Allowance for Doubtful Accounts [Roll Forward]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of period
Allowance for Doubtful Accounts Receivable, Current
Bad debt expense
Provision for Doubtful Accounts
Charged to other accounts
Valuation Allowances and Reserves, Charged to Other Accounts
Deductions
Valuation Allowances and Reserves, Deductions
End of period
Share-based Compensation [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
New Class A Units Attributable to Equity-Based Compensation [Member]
New Class A Units Attributable to Equity-Based Compensation [Member]
New Class A Units Attributable to Equity-Based Compensation [Member]
Share-based Compensation Other [Axis]
Share-based Compensation Other [Axis]
Share-based Compensation Other [Axis]
Share-based Compensation Other [Domain]
Share-based Compensation Other [Domain]
Share-based Compensation Other [Domain]
Minimum Number of Years [Member]
Minimum Number of Years [Member]
Minimum Number of Years [Member]
Maximum Number of Years [Member]
Maximum Number of Years [Member]
Maximum Number of Years [Member]
Equity-Based Compensation Information [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of different classes of membership interests prior to the Recapitalization Transactions
Different Classes of Membership Interests
Prior to the recapitalization transactions, D&P Acquisitions' capital structure consisted of seven different classes of membership interests.
New Class A Units Attributable to Equity Based Compensation [Roll Forward]
New Class A Units Attributable to Equity Based Compensation [Roll Forward] [Roll Forward]
New Class A Units Attributable to Equity Based Compensation [Roll Forward] [Roll Forward]
Beginning of period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Exercised, redeemed or exchanged
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
End of period
Vested
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number
Unvested
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Not Exercisable, Number
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Not Exercisable, Number
Shares of the Company's Class B common stock for each New Class A Unit
Number of Shares of the Company's Class B Common Stock for Each New Class A Unit
Number of Shares of the Company's Class B Common Stock for Each New Class A Unit
Price per share of Class A common stock sold in the IPO
Price Per Share of Class A Common Stock Sold in the IPO
Price Per Share of Class A Common Stock Sold in the IPO
Number of years after which restrictions lapse
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Entry into a Definitive Merger Agreement [Abstract]
Entry into a Definitive Merger Agreement [Abstract]
Entry into a Material Merger Agreement [Table]
Entry into a Material Merger Agreement [Table]
Entry into a Material Merger Agreement [Table]
Entry into a Materail Definitive Agreement [Axis]
Entry into a Materail Definitive Agreement [Axis]
Entry into a Materail Definitive Agreement [Axis]
Entry into a Materail Definitive Agreement [Domain]
Entry into a Materail Definitive Agreement [Domain]
[Domain] for Entry into a Materail Definitive Agreement [Axis]
Entry into a Material Merger Agreement [Line Items]
Entry into a Material Merger Agreement [Line Items]
[Line Items] for Entry into a Material Merger Agreement [Table]
Description of proposed merger
Description of proposed merger
Description of proposed merger
Sale of Stock, Price Per Share
Sale of Stock, Price Per Share
Merger agreement termination fee
Merger agreement termination fee
Merger agreement termination fee
Senior secured first-lien loan facilities
Senior secured first-lien loan facilities
Senior secured first-lien loan facilities
Senior secured term loan facility
Senior secured term loan facility
Senior secured term loan facility
Senior secured revolving credit facilty
Senior secured revolving credit facilty
Senior secured revolving credit facilty
Senior secured revolving credit facility available at closing
Senior secured revolving credit facility available at closing
Senior secured revolving credit facility available at closing
Description of debt financing commitment
Description of debt financing commitment
Description of debt financing commitment
Income Tax Contingency [Table]
Income Tax Contingency [Table]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Income Tax Contingency [Line Items]
Income Tax Contingency [Line Items]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits
Unrecognized Tax Benefits
Additional based on tax positions related to the current year
Unrecognized Tax Benefits, Decreases Resulting from Current Period Tax Positions
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations
Unrecognized tax benefits
Restructuring Charges [Abstract]
Restructuring and Related Activities Disclosure [Text Block]
Restructuring and Related Activities Disclosure [Text Block]
Schedule of Expected Amortization Expense [Table]
Schedule of Expected Amortization Expense [Table]
Schedule of Expected Amortization Expense [Table]
Schedule of Expected Amortization Expense [Line Items]
Schedule of Expected Amortization Expense [Line Items]
[Line Items] for Schedule of Expected Amortization Expense [Table]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
Finite-Lived Intangible Assets, Amortization Expense, Year Two
Finite-Lived Intangible Assets, Amortization Expense, Year Two
Finite-Lived Intangible Assets, Amortization Expense, Year Three
Finite-Lived Intangible Assets, Amortization Expense, Year Three
Finite-Lived Intangible Assets, Amortization Expense, Year Four
Finite-Lived Intangible Assets, Amortization Expense, Year Four
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Amortization of Intangible Assets
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Commitments and Contingencies Disclosure [Abstract]
Schedule of rental expense [Table]
Schedule of rental expense [Table]
Schedule of rental expense [Table]
Schedule of rental expense [Line Items]
Schedule of rental expense [Line Items]
[Line Items] for Schedule of rental expense [Table]
Operating Leases, Rent Expense, Net
Operating Leases, Rent Expense, Net
Other Liabilities Disclosure [Abstract]
Schedule of Other Assets and Other Liabilities [Table Text Block]
Schedule of Other Assets and Other Liabilities [Table Text Block]
Future minimum annual lease payments and obligations [Table Text Block]
Future minimum annual lease payments and obligations [Table Text Block]
Future minimum annual lease payments and obligations [Table Text Block]
Schedule of Rent Expense [Table Text Block]
Schedule of Rent Expense [Table Text Block]
Regulated Subsidiaries [Table]
Regulated Subsidiaries [Table]
Regulated Subsidiaries [Table]
Regulated Subsidiaries [Axis]
Regulated Subsidiaries [Axis]
Regulated Subsidiaries [Axis]
Regulated Subsidiaries [Domain]
Regulated Subsidiaries [Domain]
[Domain] for Regulated Subsidiaries [Axis]
Duff & Phelps Securities, LLC [Member]
Duff & Phelps Securities, LLC [Member]
Duff & Phelps Securities, LLC [Member]
Duff & Phelps Securities, Limited [Member]
Duff & Phelps Securities, Limited [Member]
Duff & Phelps Securities, Limited [Member]
GCP Securities, LLC [Member]
GCP Securities, LLC [Member]
GCP Securities, LLC [Member]
Pagemill Partners, LLC [Member]
Pagemill Partners, LLC [Member]
Pagemill Partners, LLC [Member]
Regulated Subsidiaries [Line Items]
Regulated Subsidiaries [Line Items]
[Line Items] for Regulated Subsidiaries [Table]
Net Capital
Net Capital
Excess Capital
Excess Capital
Minimum Net Capital Required
Minimum Net Capital Required
Aggregate Indebtedness
Aggregate Indebtedness
Bad Debt Expense [Table]
Bad Debt Expense [Table]
Bad Debt Expense [Table]
Bad Debt Expense [Line Items]
Bad Debt Expense [Line Items]
[Line Items] for Bad Debt Expense [Table]
Earnings Per Share [Text Block]
Earnings Per Share [Text Block]
Income Taxes Payable [Table]
Income Taxes Payable [Table]
Income Taxes Payable [Table]
Income Taxes Payable [Line Items]
Income Taxes Payable [Line Items]
[Line Items] for Income Taxes Payable [Table]
Accrued Income Taxes, Current
Accrued Income Taxes, Current
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Indefinite-lived Intangible Assets by Major Class [Axis]
Indefinite-lived Intangible Assets by Major Class [Axis]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Trade Names [Member]
Trade Names [Member]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Noncompete Agreements [Member]
Noncompete Agreements [Member]
Customer Relationships [Member]
Customer Relationships [Member]
Software [Member]
Software [Member]
Business Segments [Axis]
Business Segments [Axis]
Segment [Domain]
Segment [Domain]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross
Finite-Lived Intangible Assets, Gross
Accumulated amortization on intangible assets
Finite-Lived Intangible Assets, Accumulated Amortization
Finite-Lived Intangible Assets, Net
Finite-Lived Intangible Assets, Net
Intangible assets (net of accumulated amortization of $35,144 and $25,626 at December 31, 2012 and 2011, respectively)
Intangible Assets, Net (Excluding Goodwill)
Schedule of Class B Shares and New Class A Units Excluded [Table]
Schedule of Class B Shares and New Class A Units Excluded [Table]
Schedule of Class B Shares and New Class A Units Excluded [Table]
Weighted Average Class B Shares and New Class A Units [Axis]
Weighted Average Class B Shares and New Class A Units [Axis]
Weighted Average Class B Shares and New Class A Units [Axis]
Weighted Average Class B Shares and New Class A Units [Domain]
Weighted Average Class B Shares and New Class A Units [Domain]
Weighted Average Class B Shares and New Class A Units [Domain]
Weighted Average Class B Shares and New Class A Units [Member]
Weighted Average Class B Shares and New Class A Units [Member]
Weighted Average Class B Shares and New Class A Units [Member]
Weighted Average Class B Shares and New Class A Unit [Line Items]
Weighted Average Class B Shares and New Class A Unit [Line Items]
Weighted Average Class B Shares and New Class A Unit [Line Items]
Weighted Average Class B Shares and New Class A Units
Weighted Average Class B Shares and New Class A Units
Weighted Average Class B Shares and New Class A Units
Effective Income Tax Rate [Table]
Effective Income Tax Rate [Table]
Effective Income Tax Rate [Table]
Effective Income Tax Rate [Line Items]
Effective Income Tax Rate [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate
Effective Income Tax Rate Reconciliation, State and Local Income Taxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential
Effective Income Tax Rate Reconciliation, Permanent Differences
Effective Income Tax Rate Reconciliation, Permanent Differences
Effective Income Tax Rate Reconciliation, Permanent Differences
Effective Income Tax Rate Reconciliation, Rate Benefit as an LLC
Effective Income Tax Rate Reconciliation, Rate Benefit as an LLC
Effective Income Tax Rate Reconciliation, Rate Benefit as an LLC
Effective Income Tax Rate Reconciliation, Tax Settlements
Effective Income Tax Rate Reconciliation, Tax Settlements
Effective Income Tax Rate Reconciliation, US Benefit on Foreign Deferred Taxes
Effective Income Tax Rate Reconciliation, U.S. Benefit on Foreign Deferred Taxes
U.S. Benefit on Foreign Deferred Taxes
Effective Income Tax Rate Reconciliation, Other Adjustments
Effective Income Tax Rate Reconciliation, Other Adjustments
Effective Income Tax Rate, Continuing Operations
Effective Income Tax Rate, Continuing Operations
Charge from realignment of senior management [Abstract]
Charge from realignment of senior management [Abstract]
Charge from realignment of senior management [Text Block]
Charge from realignment of senior management [Text Block]
Charge from realignment of senior management [Text Block]
Subsequent Events [Text Block]
Subsequent Events [Text Block]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Performance Shares Excluded [Table Text Block]
Performance Shares Excluded [Table Text Block]
Performance Shares Excluded [Table Text Block]
Weighted Average Class B Shares and New Class A Units Excluded [Table Text Block]
Weighted Average Class B Shares and New Class A Units Excluded [Table Text Block]
Weighted Average Class B Shares and New Class A Units Excluded [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Quarterly Financial Information Disclosure [Abstract]
Common Stock Class B [Member]
Common Class B [Member]
Revenue
Sales Revenue, Services, Net
Reimbursable expenses
Reimbursement Revenue
Total revenue
Revenues
Operating income
Operating Income (Loss)
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Weighted average shares of Class A common stock outstanding
Weighted Average Number of Shares Outstanding Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding Basic and Diluted [Abstract]
Weighted average shares of Class A common stock outstanding, diluted
Net income per share attributable to stockholders of Class A common stock of Duff & Phelps Corporation
Earnings Per Share, Basic and Diluted [Abstract]
Fair Value Disclosures [Abstract]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value by Liability Class [Axis]
Liability Class [Axis]
Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Roll forward of acquisition-related contingent consideration payable [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of contingent consideration payable
Business Acquisition, Contingent Consideration, at Fair Value
Contingent consideration, fair market value of additions during the year
Contingent consideration, fair market value of additions during the year
Contingent consideration, fair market value of additions during the year
Payments of contingent consideration
Business Acquisition, Contingent Consideration, Cash Payment
Business Acquisition, Contingent Consideration, Cash Payment
Charge from change in fair value of estimated contingent consideration payable
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
Contingent consideration, translation adjustment
Contingent consideration, translation adjustment
Contingent consideration, translation adjustment
Fair value of contingent consideration payable
Income Statement [Abstract]
Total revenue
Direct client service costs
Cost of Services [Abstract]
Compensation and benefits (includes $19,098, $17,086 and $14,891 of equity-based compensation for the years ended December 31, 2012, 2011 and 2010, respectively)
Cost of Services, Direct Labor
Other direct client service costs
Other Cost of Services
Acquisition retention expenses (includes $2,908, $1,054 and $11 of equity-based compensation for the years ended December 31, 2012, 2011 and 2010, respectively)
Business Combination Acquisition Retention Expenses
This element represents acquisition-related retention costs incurred to effect a business combination which costs have been expensed during the period. Includes equity based compensation.
Reimbursable expenses
Cost of Reimbursable Expense
Direct client service costs
Cost of Services
Operating expenses
Operating Expenses [Abstract]
Selling, general and administrative (includes $3,531, $3,744 and $5,542 of equity-based compensation for the years ended December 31, 2012, 2011 and 2010, respectively)
Selling, General and Administrative Expense
Depreciation and amortization
Depreciation, Depletion and Amortization
Restructuring charges
Restructuring Charges
Acquisition, integration and corporate development costs
Business Combination, Acquisition Related Costs
Operating expenses
Operating Expenses
Operating income
Other expense/(income), net
Other Nonoperating Income (Expense) [Abstract]
Interest income
Investment Income, Interest
Interest expense
Interest Expense
Other expense
Other Nonoperating Income (Expense)
Other expense/(income), net
Nonoperating Income (Expense)
Income before income taxes
Net income
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information [Table Text Block]
Business Acquisition, Pro Forma Information [Table Text Block]
Quarterly Financial Information [Text Block]
Quarterly Financial Information [Text Block]
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]
Segment Reporting Disclosure [Text Block]
Statement of Other Comprehensive Income [Abstract]
Other comprehensive income/(loss), net of tax
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Amortization of post-retirement benefits
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax
Other comprehensive income/(loss), net of tax
Other Comprehensive Income (Loss), Net of Tax
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Less: comprehensive income attributable to noncontrolling interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive income attributable to Duff & Phelps Corporation
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Aggregate Performance-Based Restricted Stock Awards and Unit [Member]
Aggregate Performance-Based Restricted Stock Awards and Unit [Member]
Aggregate Performance-Based Restricted Stock Awards and Unit [Member]
Restricted Stock Awards [Member]
Restricted Stock [Member]
Restricted Stock Units [Member]
Restricted Stock Units (RSUs) [Member]
Aggregate Resticted Stock and Performance-Based Restricted Stock Awards and Units [Member]
Aggregate Resticted Stock and Performance-Based Restricted Stock Awards and Units [Member]
Aggregate Resticted Stock and Performance-Based Restricted Stock Awards and Units [Member]
Performance-Based Restricted Stock Awards [Member]
Performance-Based Restricted Stock Award [Member]
Performance-Based Restricted Stock Award [Member]
Performance-Based Restricted Stock Units [Member]
Performance-Based Restricted Stock Units [Member]
Performance-Based Restricted Stock Units [Member]
Scehdule of Awards Granted to Executives [Axis]
Scehdule of Awards Granted to Executives [Axis]
Scehdule of Awards Granted to Executives [Axis]
Awards Granted to Executives [Domain]
Awards Granted to Executives [Domain]
Awards Granted to Executives [Domain]
Awards Granted to Executives [Member]
Awards Granted to Executives [Member]
Awards Granted to Executives [Member]
Weighted Average Grant Date Fair Value [Axis]
Weighted Average Grant Date Fair Value [Axis]
Weighted Average Grant Date Fair Value [Axis]
Share-based Compensation, Weighted Average Grant Date Fair Value [Domain]
Share-based Compensation, Weighted Average Grant Date Fair Value [Domain]
Share-based Compensation, Weighted Average Grant Date Fair Value [Domain]
Weighted average grant date fair value [Member]
Share-based Compensation, Weighted Average Grant Date Fair Value [Member]
Share-based Compensation, Weighted Average Grant Date Fair Value [Member]
Restricted and Performance Based Awards [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Converted to Class A common stock upon lapse of restrictions
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited
Vested
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Weighted Average Grant Date Fair Value [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Beginning of period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Converted to Class A common stock upon lapse of restrictions
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures and Expirations in Period, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures and Expirations in Period, Weighted Average Grant Date Fair Value
End of period
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]
Related Party Transactions Disclosure [Text Block]
Schedule of Restructuring and Related Costs [Table]
Schedule of charge from realignment of senior management [Table]
Schedule of charge from realignment of senior management [Table]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Cost of Services [Member]
Cost of Services [Member]
Cost of Services [Member]
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management [Line Items]
Charge from realignment of senior management
Charge from realignment of senior management
Charge from realignment of senior management — On April 22, 2010, the Company announced certain management changes related to the departure of our former president and one of our segment leaders. The $3,100 primarily resulted from cash severance and a charge from the accelerated vesting of restricted stock awards.
Fair Value Disclosures [Text Block]
Fair Value Disclosures [Text Block]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Financial Advisory Segment [Member]
Financial Advisory Segment [Member]
Financial Advisory Segment [Member]
Alternative Asset Advisory Segment [Member]
Alternative Asset Advisory Segment [Member]
Alternative Asset Advisory Segment [Member]
Investment Banking Segment [Member]
Investment Banking Segment [Member]
Investment Banking Segment [Member]
Reportable Segment [Member]
Reportable Segment [Member]
Number of Segments [Line Items]
Segment Reporting Information [Line Items]
Net client reimbursable expenses
Net Client Reimbursable Expense
Net Client Reimbursable Expense
Equity-based compensation
Depreciation and amortization
Acquisition retention expenses
Restructuring charges
Acquisition, integration and corporate development costs
Charge from impairment of certain intangible assets
Segment operating income as a percent of revenue
Segment Operating Income as a Percent of Revenue
Segment Operating Income as a Percent of Revenue
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Date of Restructuring Plan [Axis]
Date of Restructuring Plan [Axis]
Date of Restructuring Plan [Axis]
Date of Restructuring Plan [Domain]
Date of Restructuring Plan [Domain]
Date of Restructuring Plan [Domain]
June 2011 Plan [Member]
June 2011 Plan [Member]
June 2011 Plan [Member]
March 2012 Plan [Member]
March 2012 Plan [Member]
March 2012 Plan [Member]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Restructuring Cost and Reserve [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Regulated Subsidiaries [Text Block]
Regulated Subsidiaries [Text Block]
Regulated Subsidiaries [Text Block]
Number of Segments [Table]
Number of Segments [Table]
Number of Segments [Table]
Number of segments
Number of Reportable Segments
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average IPO Options outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Goodwill and Intangible Assets Disclosure [Text Block]
Goodwill and Intangible Assets Disclosure [Text Block]
Components of Income Tax Expense [Table]
Components of Income Tax Expense [Table]
Components of Income Tax Expense [Table]
Components of Income Tax Expense [Line Items]
Components of Income Tax Expense [Line Items]
Components of Income Tax Expense [Line Items]
Current Federal Tax Expense (Benefit)
Current Federal Tax Expense (Benefit)
Current Foreign Tax Expense (Benefit)
Current Foreign Tax Expense (Benefit)
Current State and Local Tax Expense (Benefit)
Current State and Local Tax Expense (Benefit)
Current Income Tax Expense (Benefit)
Current Income Tax Expense (Benefit)
Deferred Federal Income Tax Expense (Benefit)
Deferred Federal Income Tax Expense (Benefit)
Deferred Foreign Income Tax Expense (Benefit)
Deferred Foreign Income Tax Expense (Benefit)
Deferred State and Local Income Tax Expense (Benefit)
Deferred State and Local Income Tax Expense (Benefit)
Net deferred income taxes
Deferred Income Tax Expense (Benefit)
Compensation and Employee Benefit Plans [Text Block]
Compensation and Employee Benefit Plans [Text Block]
Statement of Stockholders' Equity [Abstract]
Parent [Member]
Parent [Member]
Common Stock [Member]
Common Stock [Member]
Comprehensive Income [Member]
Comprehensive Income [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Common stock, shares, outstanding
Common Stock, Shares, Outstanding
Comprehensive income
Sale of Class A common stock
Proceeds from Issuance of Common Stock
Issuance of Class A common stock for follow-on offering, value
Stock Issued During Period, Value, New Issues
Issuance of Class A common stock for follow-on offering, shares
Stock Issued During Period, Shares, New Issues
Issuance of Class A common stock for acquisitions
Stock Issued During Period, Value, Acquisitions
Redemption of New Class A Units, shares
Partners' Capital Account, Units, Redeemed
Redemption of New Class A Units, value
Partners' Capital Account, Redemptions
Issuance of Class A common stock for acquisitions, shares
Stock Issued During Period, Shares, Acquisitions
Exchange of New Class A Units, value
Conversion of Stock, Amount Converted
Net issuance of restricted stock awards, value
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Net issuance of restricted stock awards, shares
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures
Adjustments to Tax Receivable Agreement as a result of the exchange of New Class A Units
Adjustments to Additional Paid in Capital, Other
Issuance for exercises of IPO Options
Stock Issued During Period, Value, Share-based Compensation, Gross
Issuance of Class A common stock for exercises of stock options, shares
Stock Issued During Period, Shares, Share-based Compensation, Gross
Forfeitures
Stock Issued During Period, Value, Share-based Compensation, Forfeited
Forfeitures, shares
Stock Issued During Period, Shares, Share-based Compensation, Forfeited
Equity-based compensation
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Income tax benefit on equity-based compensation
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net
Distributions to noncontrolling unitholders
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Change in ownership interests between periods
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests
Deferred tax asset effective tax rate conversion
Deferred Tax Asset Effective Tax Rate Conversion
Deferred Tax Asset Effective Tax Rate Conversion
Repurchase of Class A common stock pursuant to publicly announced program, value
Stock Repurchased During Period, Value
Adjustments to APIC for Capital Deemed Contributed
Adjustments to APIC for Capital Deemed Contributed
Adjustments to additional paid in capital for capital deemed contributed by selling shareholders of acquired businesses.
Repurchase of Class A common stock pursuant to publicly announced program, shares
Stock Repurchased During Period, Shares
Dividends on Class A common stock
Dividends, Cash
Balance
Common stock, shares, outstanding
Schedule of Equity-Based Compensation [Table Text Block]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Schedule of New Class A Units Attributable to Equity Based Compensation [Table Text Block]
Schedule of New Class A Units Attributable to Equity Based Compensation [Table Text Block]
Schedule of New Class A Units Attributable to Equity Based Compensation [Table Text Block]
Schedule of IPO Options [Table Text Block]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Schedule of Restricted Stock and Restricted Stock Units [Table Text Block]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Schedule of Performance Based Restricted Stock Awards and Units [Table Text Block]
Schedule of Performance Based Restricted Stock Awards and Units [Table Text Block]
Schedule of Performance Based Restricted Stock Awards and Units [Table Text Block]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Follow On Offering Party [Axis]
Follow On Offering Party [Axis]
Follow On Offering Party
Follow On Offering Party [Domain]
Follow On Offering Party [Domain]
Follow On Offering Party [Domain]
Follow On Offering of Selling Shareholders [Member]
Follow On Offering of Selling Shareholders [Member]
Follow On Offering of Selling Shareholders [Member]
Follow On Offering [Axis]
Follow On Offering [Axis]
Follow On Offering [Axis]
Follow On Offering [Domain]
Follow On Offering [Domain]
Follow On Offering [Domain]
Follow On Offering Q1 2012 [Member]
Follow On Offering Q1 2012 [Member]
Follow On Offering Q1 2012 [Member]
Follow On Offering Q3 2012 [Member]
Follow On Offering Q3 2012 [Member]
Follow On Offering Q3 2012 [Member]
Related Party Transactions [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Transactions with Lovell Minnick Partners [Member]
Transaction with Lovell Minnick Partners [Member]
Related Party Lovell Minnick Partners [Member]
Transactions with Vestar Capital Partners [Member]
Transactions with Vestar Capital Partners [Member]
Transactions with Vestar Capital Partners [Member]
Transactions with Noah Gottdiener [Member]
Transactions with Noah Gottdiener [Member]
Transactions with Noah Gottdiener [Member]
Transactions with Harvey Krueger [Member]
Transactions with Harvey Krueger [Member]
Transactions with Harvey Krueger [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Partners' Capital Account, Units, Redeemed
Distributions and Other Payments To Noncontrolling Unitholders
Distributions and Other Payments To Noncontrolling Unitholders
Distributions and Other Payments To Noncontrolling Unitholders
Redemption of New Class A Units, value per unit
Redemption of New Class A Units, value per unit
Redemption of New Class A Units, value per unit
Redemption of New Class A Units, value
Corresponding Shares of Class B Common Stock Cancelled
Corresponding Shares of Class B Common Stock Cancelled
Corresponding Shares of Class B Common Stock Cancelled
Revenue from Related Parties
Revenue from Related Parties
Stock Sold by Affiliate, Shares
Stock Sold by Affiliate, Shares
Stock Sold by Affiliate, Shares
Stock Sold by Affiliates, Value Per Share
Stock Sold by Affiliates, Value Per Share
Stock Sold by Affiliates, Value Per Share
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
Schedule of Other Liabilities [Table]
Schedule of Other Liabilities [Table]
Schedule of Other Liabilities [Table]
Schedule of Other Liabilities [Axis]
Schedule of Other Liabilities [Axis]
Schedule of Other Liabilities [Axis]
Schedule of Other Liabilities [Domain]
Schedule of Other Liabilities [Domain]
[Domain] for Schedule of Other Liabilities [Axis]
Schedule of Other Liabilities [Line Items]
Schedule of Other Liabilities [Line Items]
[Line Items] for Schedule of Other Liabilities [Table]
Deferred rent
Deferred Rent Credit, Noncurrent
Contingent consideration payable, less current portion
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent
Other
Other Sundry Liabilities, Noncurrent
Other long-term liabilities
Other Liabilities, Noncurrent
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Goodwill [Line Items]
Goodwill [Line Items]
Schedule of Goodwill [Table Text Block]
Schedule of Goodwill [Table Text Block]
Schedule of Amortization Expense [Table Text Block]
Schedule of Amortization Expense [Table Text Block]
[Table Text Block] for Schedule of Amortization Expense [Table]
Schedule of related party transactions, by related party [Table Text Block]
Schedule of related party transactions, by related party [Table Text Block]
Schedule of related party transactions, by related party [Table Text Block]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Stock Options [Member]
Stock Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis]
Exercise Price Range [Axis]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Stock Option Activity [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Unvested
Share-based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Numbe
Share-based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number
Weighted average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Weighted average remaining contractual term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Total intrinsic value of exercised options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Total fair value of vested options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Total Fair Value of Vested Options
Total Fair Value of Vested Options
Aggregate intrinsic value of outstanding options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value [Roll Forward]
Beginning of period
Weighed Average Grant Date Fair Value
Weighed Average Grant Date Fair Value
Exercised
Weighted Average Grant Date Fair Value, Options Exercised
Weighted average grant date fair value for options exercised.
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Grant Date Fair Value
End of period
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method
Finite-Lived Intangible Assets, Amortization Method
Future Minimum Lease Payments [Table]
Future Minimum Lease Payments [Table]
Future Minimum Lease Payments [Table]
Type of minimum lease payments and obligations [Axis]
Type of minimum lease payments and obligations [Axis]
Type of minimum lease payments and obligations [Axis]
Type of minimum lease payments and obligations [Domain]
Type of minimum lease payments and obligations [Domain]
[Domain] for Type of minimum lease payments and obligations [Axis]
Operating leases [Member]
Operating leases [Member]
Operating leases [Member]
Payments pursuant to the TRA [Member]
Payments pursuant to the TRA [Member]
Payments pursuant to the TRA [Member]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Contingent consideration obligations [Member]
Contingent consideration obligations [Member]
Contingent consideration obligations [Member]
Future minimum lease payments [Line Items]
Future minimum lease payments [Line Items]
[Line Items] for Future minimum lease payments [Table]
Operating Leases, Future Minimum Payments Due
Operating Leases, Future Minimum Payments Due, Next Twelve Months
Operating Leases, Future Minimum Payments, Due in Two Years
Operating Leases, Future Minimum Payments, Due in Two Years
Operating Leases, Future Minimum Payments, Due in Three Years
Operating Leases, Future Minimum Payments, Due in Three Years
Operating Leases, Future Minimum Payments, Due in Four Years
Operating Leases, Future Minimum Payments, Due in Four Years
Operating Leases, Future Minimum Payments, Due in Five Years
Operating Leases, Future Minimum Payments, Due in Five Years
Future minimum lease payments and obligations
Operating Leases, Future Minimum Payments, Due Thereafter
Business Combination Disclosure [Text Block]
Business Combination Disclosure [Text Block]
Description of Business [Table]
Description of Business [Table]
Description of Business [Table]
Description of Business [Line Items]
Description of Business [Line Items]
Description of Business [Line Items]
Minimum Number of Employees
Minimum Number of Employees
Minimum Number of Employees
Other Liabilities Disclosure [Text Block]
Other Liabilities Disclosure [Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table]
Schedule of Deferred Tax Assets and Liabilities [Table]
Schedule of Deferred Tax Assets and Liabilities [Table]
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Schedule of Deferred Tax Assets and Liabilities [Line Items]
[Line Items] for Schedule of Deferred Tax Assets and Liabilities [Table]
Current deferred tax assets [Abstract]
Deferred Tax Assets, Net of Valuation Allowance, Current Classification [Abstract]
Current deferred tax assets, compensation and benefits
Current deferred tax assets, compensation and benefits
Current deferred tax assets, compensation and benefits
Current deferred tax assets, accrued lease termination
Current deferred tax assets, accrued lease termination
Current deferred tax assets, accrued lease termination
Current deferred tax assets, other
Current deferred tax assets, other
Current deferred tax assets, other
Net deferred income taxes, current
Deferred Tax Assets, Net of Valuation Allowance, Current
Current deferred tax liabilities [Abstract]
Current deferred tax liabilities [Abstract]
Current deferred tax liabilities [Abstract]
Current deferred tax liabilities, prepaid expenses
Current deferred tax liabilities, prepaid expenses
Current deferred tax liabilities, prepaid expenses
Current deferred tax liabilities, compensation and benefits
Current deferred tax liabilities, compensation and benefits
Current deferred tax liabilities, compensation and benefits
Total current deferred tax liabilities
Total current deferred tax liabilities
Total current deferred tax liabilities
Net deferred income taxes, current
Deferred Tax Assets, Net, Current
Long-term deferred tax assets [Abstract]
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract]
Long-term deferred tax assets, goodwill and other intangibles
Long-term deferred tax assets, goodwill and other intangibles
Long-term deferred tax assets, goodwill and other intangibles
Long-term deferred tax assets, compensation and benefits
Long-term deferred tax assets, compensation and benefits
Long-term deferred tax assets, compensation and benefits
Long-term deferred tax assets, foreign net operating losses
Long-term deferred tax assets, foreign net operating losses
Long-term deferred tax assets, foreign net operating losses
Long-term deferred tax assets, deferred rent
Long-term deferred tax assets, deferred rent
Long-term deferred tax assets, deferred rent
Long-term deferred tax assets, foreign tax credits
Long-term deferred tax assets, foreign tax credits
Long-term deferred tax assets, foreign tax credits
Long-term deferred tax assets, other
Long-term deferred tax assets, other
Long-term deferred tax assets, other
Long-term deferred tax liabilities, property and equipment
Long-term deferred tax liabilities, property and equipment
Long-term deferred tax liabilities, property and equipment
Long-term deferred tax assets, valuation allowance
Long-term deferred tax assets, valuation allowance
Long-term deferred tax assets, valuation allowance
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent
Long-term deferred tax liabilities [Abstract]
Long-term deferred tax liabilities [Abstract]
Long-term deferred tax liabilities [Abstract]
Long-term deferred tax liabilities, goodwill and other intangibles
Long-term deferred tax liabilities, goodwill and other intangibles
Long-term deferred tax liabilities, goodwill and other intangibles
Long-term deferred tax liabilities, other
Long-term deferred tax liabilities, other
Long-term deferred tax liabilities, other
Deferred Tax Liabilities, Gross, Noncurrent
Deferred Tax Liabilities, Gross, Noncurrent
Net deferred income taxes, less current portion
Deferred Tax Assets, Net, Noncurrent
Deferred Tax Assets, Net
Deferred Tax Assets, Net
Income Tax Disclosure [Text Block]
Income Tax Disclosure [Text Block]
Statement of Financial Position [Abstract]
Line of Credit Facility [Axis]
Lender Name [Axis]
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Lender [Domain]
Credit Facility [Member]
Line of Credit [Member]
ASSETS
Assets [Abstract]
Current assets
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Accounts receivable (net of allowance for doubtful accounts of $2,037 and $1,753 at December 31, 2012 and 2011, respectively)
Accounts Receivable, Net, Current
Unbilled services
Unbilled Contracts Receivable
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Total current assets
Assets, Current
Property and equipment (net of accumulated depreciation of $39,534 and $32,516 at December 31, 2012 and 2011, respectively)
Property, Plant and Equipment, Net
Goodwill
Goodwill
Other assets
Other Assets, Noncurrent
Investments related to deferred compensation plan
Deferred Compensation Plan Assets
Total non-current assets
Assets, Noncurrent
Total assets
Assets
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities and Equity [Abstract]
Current liabilities
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Accrued expenses
Accrued Liabilities, Current
Accrued compensation and benefits
Employee-related Liabilities, Current
Liability related to deferred compensation plan, current portion
Deferred Compensation Liability, Current
Deferred revenues
Deferred Revenue, Current
Other current liabilities
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Long-term debt
Long-term Debt
Liability related to deferred compensation plan, less current portion
Deferred Compensation Liability, Classified, Noncurrent
Due to noncontrolling unitholders, less current portion
Noncontrolling Interest Liability Noncurrent
The amount due to noncontrolling unitholders under the tax receivable agreement (TRA), noncurrent portion.
Total non-current liabilities
Liabilities, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies
Commitments and Contingencies
Stockholders' equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock (50,000 shares authorized; zero issued and outstanding)
Preferred Stock, Value, Issued
Common stock value
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Retained earnings
Retained Earnings (Accumulated Deficit)
Total stockholders' equity of Duff & Phelps Corporation
Stockholders' Equity Attributable to Parent
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest
Total stockholders' equity
Total liabilities and stockholders' equity
Liabilities and Equity
Noncontrolling Interest Disclosure [Text Block]
Noncontrolling Interest Disclosure [Text Block]
Series of Individually Immaterial Business Acquisitions [Member]
Series of Individually Immaterial Business Acquisitions [Member]
Acquisition of Growth Capital Partners [Member]
Acquisition of Growth Capital Partners [Member]
Acquisition of Growth Capital Partners [Member]
Acquisition of MCR [Member]
Acquisition of MCR [Member]
Acquisition of MCR [Member]
Acquisition of RSM Richter Toronto Restructuring [Member]
Acquisition of RSM Richter Toronto Restructuring [Member]
Acquisition of RSM Richter Toronto Restructuring [Member]
Acquisition of Pagemill Partners [Member]
Acquisition of Pagemill Partners [Member]
Acquisition of Pagemill Partners [Member]
Goodwill
Goodwill, Acquired During Period
Goodwill, Acquired During Period
Goodwill, Translation Adjustments
Goodwill, Translation Adjustments
Goodwill
Schedule of Quarterly Financial Information [Table Text Block]
Schedule of Quarterly Financial Information [Table Text Block]
Schedule of Company Contributions to 401(k) Plan [Table Text Block]
Schedule of Company Contributions to 401(k) Plan [Table Text Block]
Schedule of Company Contributions to 401(k) Plan [Table Text Block]
Statement of Cash Flows [Abstract]
Supplemental disclosures of cash flow activities:
Supplemental Cash Flow Information [Abstract]
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to net cash provided by operating activites:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Net deferred income taxes
Increase (Decrease) in Deferred Income Taxes
Other
Other Operating Activities, Cash Flow Statement
Changes in assets and liabilities providing/(using) cash, net of acquired balances
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Unbilled services
Increase (Decrease) in Unbilled Receivables
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Other assets
Increase (Decrease) in Other Operating Assets
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Accrued compensation and benefits
Increase (Decrease) in Employee Related Liabilities
Deferred revenues
Increase (Decrease) in Deferred Revenue
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Payments Pursuant to the Tax Receivable Agreement
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchase of property and equipment
Payments to Acquire Property, Plant, and Equipment
Business acquisitions, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Purchase of investments
Payments to Acquire Investments
Increase in Restricted Cash
Increase (Decrease) in Restricted Cash
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from financing activities:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings under revolving line of credit
Proceeds from Lines of Credit
Repayments of revolving line of credit
Repayments of Lines of Credit
Net proceeds from sale of Class A common stock
Proceeds from Issuance or Sale of Equity
Redemption of noncontrolling unitholders
Redemption of Noncontrolling Unitholders
Redemption of Noncontrolling Unitholders
Dividends
Payments of Dividends
Repurchases of Class A common stock
Payments for Repurchase of Common Stock
Distributions and other payments to noncontrolling unitholders
Payments of Debt Issuance Costs
Payments of Debt Issuance Costs
Proceeds from exercises of stock options
Proceeds from Stock Options Exercised
Excess tax benefit from equity-based compensation
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Effect of exchange rate on cash and cash equivalents
Effect of Exchange Rate on Cash and Cash Equivalents
Net increase/(decrease) in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Interest paid
Interest Paid
Income taxes paid
Income Taxes Paid
Supplemental disclosures of non-cash investing and financing activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Summary of Income Tax Contingencies [Table Text Block]
Summary of Income Tax Contingencies [Table Text Block]
Awards Granted to Board of Directors [Member]
Awards Granted to Board of Directors [Member]
Awards Granted to Board of Directors [Member]
Share-based Compensation Reporting Facts [Member]
Share-based Compensation Reporting Facts [Member]
Share-based Compensation Reporting Facts [Member]
Number of shares authorized under the Company's Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
Number of Ongoing RSAs issued during the period
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Minimum forfeiture rate
Share-based Compensatino Arranagement by Share-based Payment Award, Forfeiture Rate, Minimum
Share-based Compensatino Arranagement by Share-based Payment Award, Forfeiture Rate, Minimum
Maximum forfeiture rate
Share-based Compensation Arranagement by Share-based Payment Award, Forfeiture Rate, Maximum
Share-based Compensation Arranagement by Share-based Payment Award, Forfeiture Rate, Maximum
Unamortized compensation cost related to all non-vested awards
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized
Amount of deferred tax benefit utilized in conjunction with stock options and RSAs
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Summary of Bad Debt Expense [Table Text Block]
Summary of Bad Debt Expense [Table Text Block]
Summary of Bad Debt Expense [Table Text Block]
Noncontrolling Interest [Table]
Noncontrolling Interest [Table]
Other Ownership Interests by Name [Axis]
Other Ownership Interests Name [Axis]
Ownership of New Class A Units [Domain]
Total Units of DandP Acquisitions [Domain]
Total Units of D and P Acquisitions [Domain]
Noncontrolling Interest [Line Items]
Noncontrolling Interest [Line Items]
Ownership of New Class A Units [Roll Forward]
Ownership of New Class A Units [Roll Forward]
Ownership of New Class A Units [Roll Forward]
Stock Repurchased During Period, Shares
Total ownership percentage of New Class A Units
Total ownership percentage of Duff & Phelps Corporation
Total ownership percentage of Duff & Phelps Corporation
Ownership percentage by Duff & Phelps Corporation
Noncontrolling Interest, Ownership Percentage by Parent
Ownership percentage by noncontrolling owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Entities [Table]
Entities [Table]
Entity Information [Line Items]
Entity Information [Line Items]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Public Float
Entity Public Float
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets
Assets, Fair Value Disclosure
Deferred Compensation Liability, Current and Noncurrent
Deferred Compensation Liability, Current and Noncurrent
Fair value of contingent consideration payable
Total liabilities
Liabilities, Fair Value Disclosure
Schedule of Follow On Offering [Table]
Schedule of Follow On Offering [Table]
Schedule of Follow On Offering [Table]
Follow On Offering of the Company [Member]
Follow On Offering of the Company [Member]
Follow On Offering of the Company [Member]
Follow On Offering of Underwriter to Public [Member]
Follow On Offering of Underwriter to Public [Member]
Follow On Offering of Underwriter to Public [Member]
Follow On Offering of Affiliate (Shinsei) [Member]
Follow On Offering of Affiliate (Shinsei) [Member]
Follow On Offering of Affiliate (Shinsei) [Member]
Follow On Offering [Line Items]
Follow On Offering [Line Items]
Follow On Offering [Line Items]
Stock Issued During Period, Value Per Share, New Issues
Stock Issued During Period, Value Per Share, New Issues
Stock Issued During Period, Value Per Share, New Issues
Stock Issued During Period, Value, New Issues, Gross
Stock Issued During Period, Value, New Issues, Gross
Stock Issued During Period, Value, New Issues, Gross
Stock Issued During Period, Value Per Share, Underwriter to Public
Stock Issued During Period, Value Per Share, Underwriter to Public
Stock Issued During Period, Value Per Share, Underwriter to Public
Stock Issued During Period, Value, Underwriter to Public
Stock Issued During Period, Value, Underwriter to Public
Stock Issued During Period, Value, Underwriter to Public
Stock Sold by Affiliates, Value
Stock Sold by Affiliates, Value
Stock Sold by Affiliates, Value
Allowance for doubtful accounts
Noncurrent assets
Assets, Noncurrent [Abstract]
Accumulated depreciation on property and equipment
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated amortization on intangible assets
Stockholders' equity
Preferred stock, shares authorized
Preferred Stock, Shares Authorized
Preferred stock, shares issued
Preferred Stock, Shares Issued
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding
Common stock, par value
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares issued
Common Stock, Shares, Issued
Common stock, shares outstanding
Schedule of Performance Based Awards Excluded from Computation of Earnings Per Share [Table]
Schedule of Performance Based Awards Excluded from Computation of Earnings Per Share [Table]
Schedule of Performance Based Awards Excluded from Computation of Earnings Per Share [Table]
Weighted Average Performance-Based Restricted Stock Awards [Line Items]
Weighted Average Performance-Based Restricted Stock Awards [Line Items]
Weighted Average Performance-Based Restricted Stock Awards [Line Items]
Weighted Average Number of Shares, Restricted Stock
Weighted Average Number of Shares, Restricted Stock
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Description
Line of Credit Facility, Description
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Sub-limit for the issuance of letters of credit
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases
Maturity date
Line of Credit Facility, Expiration Date
Amount of outstanding letters of credit
Letters of Credit Outstanding, Amount
Interest rate description
Line of Credit Facility, Interest Rate Description
Covenants
Line of Credit Facility, Covenant Terms
Line of Credit Facility, Covenant Compliance
Line of Credit Facility, Covenant Compliance
Schedule of Property, Plant and Equipment [Table]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Depreciation
Depreciation
Furniture and Fixtures, Gross
Furniture and Fixtures, Gross
Leasehold Improvements, Gross
Leasehold Improvements, Gross
Capitalized Computer Software, Gross
Capitalized Computer Software, Gross
Property, Plant and Equipment, Gross
Property, Plant and Equipment, Gross
Accumulated depreciation on property and equipment
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Number of Client Service Professionals Acquired
Number of Client Service Professionals Acquired
Number of Client Service Professionals Acquired
Number of Managing Directors Acquired
Number of Managing Directors Acquired
Number of Managing Directors Acquired
Number of Partners and Directors Acquired
Number of Partners and Directors Acquired
Number of Partners and Directors Acquired
Revenue of acquiree since acquisition date
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual
Earnings or loss of acquiree since acquisition date
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual
Fair value of the purchase price
Business Acquisition, Cost of Acquired Entity, Purchase Price
Charge from change in fair value of estimated contingent consideration payable
Purchase price allocation, net tangible assets
Business Acquisition, Purchase Price Allocation, Net Tangible Assets
Purchase price allocation, amortizable intangible assets
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets
Purchase price allocation, goodwill
Business Acquisition, Purchase Price Allocation, Goodwill Amount
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Information [Abstract]
Pro forma revenue, excluding reimbursable expenses
Business Acquisition, Pro Forma Revenue, Excluding Reimbursable Expenses
Business Acquisition, Pro Forma Revenue, Excluding Reimbursable Expenses
Pro forma revenue, reimbursable expense
Business Acquisition, Pro Forma Revenue, Reimbursable Expense
Business Acquisition, Pro Forma Revenue, Reimbursable Expenses
Pro forma revenue
Business Acquisition, Pro Forma Revenue
Pro forma net income (loss)
Business Acquisition, Pro Forma Net Income (Loss)
Pro forma earnings per share, basic
Business Acquisition, Pro Forma Earnings Per Share, Basic
Pro forma earnings per share, diluted
Business Acquisition, Pro Forma Earnings Per Share, Diluted
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Statement, Geographical [Axis]
Geographical [Axis]
Segment, Geographical [Domain]
Segment, Geographical [Domain]
United States [Member]
Segment, Geographical, Groups of Countries, Group One [Member]
Europe [Member]
Segment, Geographical, Groups of Countries, Group Two [Member]
Asia [Member]
Segment, Geographical, Groups of Countries, Group Three [Member]
Segment, Geographical, Groups of Countries, Group Three [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers and Long-Lived Assets [Line Items]
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries
Financial Advisory revenue from cross utilization of professionals on Alternative Asset Advisory engagements
Financial Advisory Revenue from Cross Utilization
Financial Advisory Revenue from Cross Utilization
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies Disclosure [Text Block]
Maximum Remaining Potential Contingent Considertion [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Maximum Remaining Potential Contingent Consideration [Axis]
Maximum Remaining Potential Contingent Consideration [Axis]
Maximum Remaining Potential Contingent Consideration [Axis]
Maximum Remaining Potential Contingent Consideration [Domain]
Maximum Remaining Potential Contingent Consideration [Domain]
Maximum Remaining Potential Contingent Consideration [Domain]
Maximum Remaining Potential Contingent Consideration [Line Items]
Maximum Remaining Potential Contingent Consideration [Line Items]
Maximum Remaining Potential Contingent Consideration [Line Items]
Maximum remaining potential contingent consideration
Business Acquisition, Contingent Consideration, Potential Cash Payment
Office Consolidations [Member]
Office Consolidations [Member]
Office Consolidations [Member]
Employee Severance [Member]
Employee Severance [Member]
Restructuring Reserve, Translation Adjustment
Restructuring Reserve, Translation Adjustment
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Restructuring reserve
Restructuring Reserve
Cash payments
Restructuring Reserve, Settled with Cash
Write-off of furniture and fixtures
Restructuring Reserve, Accrual Adjustment
Restructuring reserve