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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Y Segment | Dec. 31, 2013 | Dec. 31, 2012
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable business segments | 5 us-gaap_NumberOfReportableSegments |  |
Research and development costs related to software development | $ 19,300,000 us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost | $ 15,800,000 us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost | $ 20,200,000 us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost
Advertising costs | 20,700,000 us-gaap_AdvertisingExpense | 20,700,000 us-gaap_AdvertisingExpense | 21,800,000 us-gaap_AdvertisingExpense
Restricted cash | 300,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 900,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |
Provision for doubtful accounts | 18,252,000 us-gaap_ProvisionForDoubtfulAccounts | 13,335,000 us-gaap_ProvisionForDoubtfulAccounts | 14,179,000 us-gaap_ProvisionForDoubtfulAccounts
Forgivable loans, forgiveness period, minimum | 1 fcn_ForgivableLoansForgivenessPeriodMinimum |  |
Forgivable loans, forgiveness period, maximum | 10 fcn_ForgivableLoansForgivenessPeriodMaximum |  |
Unamortized capitalized software cost | 13,400,000 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers | 12,900,000 us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers |
Amortization of capitalized software cost | 6,700,000 us-gaap_CapitalizedComputerSoftwareAmortization | 5,800,000 us-gaap_CapitalizedComputerSoftwareAmortization | 3,700,000 us-gaap_CapitalizedComputerSoftwareAmortization
Deferred rent | $ 42,000,000 us-gaap_DeferredRentCredit | $ 41,000,000 us-gaap_DeferredRentCredit |
Minimum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Definite-lived intangible assets amortization period | 1 year |  |
Maximum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Definite-lived intangible assets amortization period | 15 years |  |
Lease provisions for renewal options (In years) | 5 fcn_LeaseProvisionRenewalOptionTerm / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Furniture, Equipment, And Internal-Use Software | Minimum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 3 years |  |
Furniture, Equipment, And Internal-Use Software | Maximum |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 7 years |  |
Software and Software Development Costs |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 3 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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