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Activity Related to Liability for Special Charges (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($)
Special Charges [Line Items] |  |
Beginning Balance | $ 11,560 |
Payments | (2,393) |
Ending Balance | 9,167 | [1]
Employee Termination Costs |  |
Special Charges [Line Items] |  |
Beginning Balance | 8,225 |
Payments | (2,358) |
Ending Balance | 5,867 | [1]
Lease Termination Costs |  |
Special Charges [Line Items] |  |
Beginning Balance | 3,335 |
Payments | (35) |
Ending Balance | $ 3,300 | [1]
[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 Special Charges [Line Items] + References No definition available. + Details
Name: | fcn_SpecialChargesLineItems
Namespace Prefix: | fcn_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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- Definition Amount of 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_SpecialChargesReserveSettledWithCash
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=fcn_LeaseTerminationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |