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Change In Acquisition-Related Contingent Consideration Liability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items] |
Acquisition-related contingent consideration liability | $ 2.5

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- Definition Business Acquisition Contingent Consideration Reduction Of Liability Due To Elimination of Contingency + References No definition available. + Details
Name: | fcn_BusinessAcquisitionContingentConsiderationReductionOfLiabilityDueToEliminationOfContingency
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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