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Special Charges - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Employee | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Other Income And Expenses [Abstract] |  |  |  |  |
Special charges | $ 5,061 |  |  |  |
Number of employees terminated for future growth | Employee | 53 |  |  |  |
Total cash outflow associated with special charges, amount expected to be paid | $ 4,900 |  | $ 65,500 | $ 65,500 | $ 65,500
Cash outflow associated with special charges, amount paid | 2,300 | $ 54,300 |  |  |
Cash outflow associated with special charges, amount expected to be paid in remainder of 2016 | 2,300 |  |  |  |
Cash outflow associated with special charges, amount expected to be paid in 2017 | 300 |  |  |  |
Total expected payments to special charges, amount expected to be paid in 2016 | 2,700 |  |  |  |
Total expected payments to special charges, amount expected to be paid in 2017 | 3,100 |  |  |  |
Total expected payments to special charges, amount expected to be paid in 2018 | 2,600 |  |  |  |
Total expected payments to special charges, amount expected to be paid in 2019 | 1,200 |  |  |  |
Total expected payments to special charges, amount expected to be paid from 2020 to 2026 | $ 1,600 |  |  |  |

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

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- Definition Expected payments special charges of fiscal year five to year eleven. + References No definition available. + Details
Name: | fcn_ExpectedPaymentsSpecialChargesOfFiscalYearFiveToYearEleven
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expected payments special charges of fiscal year four. + References No definition available. + Details
Name: | fcn_ExpectedPaymentsSpecialChargesOfFiscalYearFour
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expected payments special charges of fiscal year three. + References No definition available. + Details
Name: | fcn_ExpectedPaymentsSpecialChargesOfFiscalYearThree
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expected payments special charges of fiscal year two. + References No definition available. + Details
Name: | fcn_ExpectedPaymentsSpecialChargesOfFiscalYearTwo
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expected payments special charges remainder of fiscal year. + References No definition available. + Details
Name: | fcn_ExpectedPaymentsSpecialChargesRemainderOfFiscalYear
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Number of employees terminated. + References No definition available. + Details
Name: | fcn_NumberOfEmployeesTerminated
Namespace Prefix: | fcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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