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Special Charges By Segment (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
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges | $ 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
Operating Segments |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 426 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 12,478 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 28,425 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | Corporate Finance / Restructuring |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 84 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_CorporateFinanceRestructuringMember | 10,274 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_CorporateFinanceRestructuringMember | 11,332 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_CorporateFinanceRestructuringMember
Operating Segments | Forensic and Litigation Consulting |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 308 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_ForensicAndLitigationConsultingMember | 2,111 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_ForensicAndLitigationConsultingMember | 8,276 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_ForensicAndLitigationConsultingMember
Operating Segments | Economic Consulting |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 12 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_EconomicConsultingMember | 11 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_EconomicConsultingMember | 991 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_EconomicConsultingMember
Operating Segments | Technology |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 19 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_TechnologyMember | 16 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_TechnologyMember | 3,114 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_TechnologyMember
Operating Segments | Strategic Communications |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 3 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_StrategicCommunicationsMember | 66 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_StrategicCommunicationsMember | 4,712 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = fcn_StrategicCommunicationsMember
Unallocated Corporate |  |  |  |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | $ 15,913 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = fcn_UnallocatedCorporateMember | $ 25,936 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = fcn_UnallocatedCorporateMember | $ 1,132 fcn_SpecialChargesAmount / us-gaap_ConsolidationItemsAxis = fcn_UnallocatedCorporateMember

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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
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