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Special Charges By Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Special Charges [Line Items] |  |
Special charges | $ 427 | $ 29,600
Corporate Finance / Restructuring |  |
Special Charges [Line Items] |  |
Special charges | 68 |
Forensic and Litigation Consulting |  |
Special Charges [Line Items] |  |
Special charges | 173 |
Economic Consulting |  |
Special Charges [Line Items] |  |
Special charges | (4) |
Technology |  |
Special Charges [Line Items] |  |
Special charges | 14 |
Strategic Communications |  |
Special Charges [Line Items] |  |
Special charges | 64 |
Total Reportable Segments |  |
Special Charges [Line Items] |  |
Special charges | 315 |
Unallocated Corporate |  |
Special Charges [Line Items] |  |
Special charges | $ 112 |

X
- 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

X
- Details
Name: | fcn_SpecialChargesLineItems
Namespace Prefix: | fcn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration