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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
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 5us-gaap_NumberOfReportableSegments    
Research and development costs related to software development $ 19,300,000us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost $ 15,800,000us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost $ 20,200,000us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost
Advertising costs 20,700,000us-gaap_AdvertisingExpense 20,700,000us-gaap_AdvertisingExpense 21,800,000us-gaap_AdvertisingExpense
Restricted cash 300,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 900,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue  
Provision for doubtful accounts 18,252,000us-gaap_ProvisionForDoubtfulAccounts 13,335,000us-gaap_ProvisionForDoubtfulAccounts 14,179,000us-gaap_ProvisionForDoubtfulAccounts
Forgivable loans, forgiveness period, minimum 1fcn_ForgivableLoansForgivenessPeriodMinimum    
Forgivable loans, forgiveness period, maximum 10fcn_ForgivableLoansForgivenessPeriodMaximum    
Unamortized capitalized software cost 13,400,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers 12,900,000us-gaap_CapitalizedSoftwareDevelopmentCostsForSoftwareSoldToCustomers  
Amortization of capitalized software cost 6,700,000us-gaap_CapitalizedComputerSoftwareAmortization 5,800,000us-gaap_CapitalizedComputerSoftwareAmortization 3,700,000us-gaap_CapitalizedComputerSoftwareAmortization
Deferred rent $ 42,000,000us-gaap_DeferredRentCredit $ 41,000,000us-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) 5fcn_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