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Special Charges - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) Employee | Dec. 31, 2015 USD ($)
Other Income And Expenses [Abstract] |  |  |
Special charges | $ 1,750 | $ 6,811 |
Number of employees terminated for future growth | Employee |  | 19 |
Special charges liability | $ 14,102 | $ 14,102 | $ 11,813
Total expected payments to special charges, amount expected to be paid in 2016 |  | 4,500 |
Total expected payments to special charges, amount expected to be paid in 2017 |  | 4,100 |
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 |  | $ 1,700 |

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

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination and to asset retirement obligations. + References No definition available. + Details
Name: | fcn_SpecialChargesReserve
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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