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Special Charges - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Income And Expenses [Abstract] |  |  |  |  |  |  |
Special charges | $ 1,628,000 | $ 5,347,000 | $ 9,364,000 | $ 0 | $ 16,339,000 | $ 38,414,000 |
Non cash special charges |  |  |  |  | 700,000 | 14,100,000 |
Total cash outflow associated with special charges, amount paid |  |  |  |  | $ 65,500,000 | $ 65,500,000 | $ 65,500,000
Cash outflow associated with special charges, amount paid |  |  |  | 53,700,000 |  |  |
Cash outflow associated with special charges, amount expected to be paid in 2016 |  |  |  | 3,200,000 |  |  |
Cash outflow associated with special charges, amount expected to be paid in 2017 |  |  |  | 3,200,000 |  |  |
Cash outflow associated with special charges, amount expected to be paid in 2018 |  |  |  | 2,600,000 |  |  |
Cash outflow associated with special charges, amount expected to be paid in 2019 |  |  |  | 1,200,000 |  |  |
Cash outflow associated with special charges, amount expected to be paid from 2020 to 2025 |  |  |  | $ 1,600,000 |  |  |

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- Definition Amounts paid as of the current balance sheet date related to the current period special charges. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total cash outflows associated with related charges recorded in the current period, including amounts already paid. + References No definition available. + Details
Name: | fcn_ExpectedCashOutflowFromCurrentPeriodSpecialCharges
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
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- Definition Expected Cash Outflow From Special Charges From Year Five To Year Eleven + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Expected Cash Outflow From Special Charges Year Four + References No definition available. + Details
Name: | fcn_ExpectedCashOutflowFromSpecialChargesYearFour
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Cash outflows expected to be paid during the fiscal year following this fiscal year related to the special charges recorded in the period. + References No definition available. + Details
Name: | fcn_ExpectedCashOutflowFromSpecialChargesYearOne
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash outflows expected to be paid during the third fiscal year following this fiscal year related to the special charges recorded in the period. + References No definition available. + Details
Name: | fcn_ExpectedCashOutflowFromSpecialChargesYearThree
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Cash outflows expected to be paid during the second fiscal year following this fiscal year related to the special charges recorded in the period. + References No definition available. + Details
Name: | fcn_ExpectedCashOutflowFromSpecialChargesYearTwo
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Data Type: | xbrli:monetaryItemType
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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of consideration other than cash paid in the period to fully or partially settle a specified, previously accrued type of special charge. + References No definition available. + Details
Name: | fcn_SpecialChargesReserveSettledWithoutCash
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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