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Summary of Changes in Carrying Amount of Notes Receivable From Employees (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Accelerated recognition of amortization expense | $ 1,628 fcn_SpecialChargesAmount | $ 5,347 fcn_SpecialChargesAmount | $ 9,364 fcn_SpecialChargesAmount | $ 27,568 fcn_SpecialChargesAmount | $ 10,419 fcn_SpecialChargesAmount | $ 427 fcn_SpecialChargesAmount | $ 16,339 fcn_SpecialChargesAmount | $ 38,414 fcn_SpecialChargesAmount | $ 29,557 fcn_SpecialChargesAmount
Notes Receivable From Employees |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Accelerated recognition of amortization expense |  |  |  |  |  |  |  | $ 2,300 fcn_SpecialChargesAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_NotesReceivableMember |

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- Definition The charge against earnings in the period, comprised of costs associated with non-recurring activities related to our global branding strategy and other strategic branding decisions, a realignment of our workforce and consolidation of office locations. + References No definition available. + Details
Name: | fcn_SpecialChargesAmount
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_NotesReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |