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Activity Related to Liability for Special Charges (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Other Income And Expenses [Abstract] |  |  |
Special charges remaining liability | $ 9,167 | [1] | $ 11,560
Total expected payments to special charges, amount expected to be paid in 2017 | 3,600 |  |
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 in 2020 | 400 |  |
Total expected payments to special charges, amount expected to be paid from 2021 to 2025 | $ 1,400 |  |
[1] | Of the $9.2 million remaining liability for special charges, $3.6 million is expected to be paid in the remainder of 2017, $2.6 million is expected to be paid in 2018, $1.2 million is expected to be paid in 2019, $0.4 million is expected to be paid in 2020 and the remaining balance of $1.4 million is expected to be paid from 2021 to 2025.

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- Definition Expected payments special charges of fiscal year five to year nine. + 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
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
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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 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
Name: | fcn_ExpectedPaymentsSpecialChargesRemainderOfFiscalYear
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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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