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Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 425,158 us-gaap_Revenues | $ 451,178 us-gaap_Revenues | $ 454,324 us-gaap_Revenues | $ 425,552 us-gaap_Revenues | $ 415,998 us-gaap_Revenues | $ 414,643 us-gaap_Revenues | $ 414,613 us-gaap_Revenues | $ 407,178 us-gaap_Revenues | $ 1,756,212 us-gaap_Revenues | $ 1,652,432 us-gaap_Revenues | $ 1,576,871 us-gaap_Revenues
Direct cost of revenues | 281,689 us-gaap_CostOfRevenue | 293,244 us-gaap_CostOfRevenue | 295,549 us-gaap_CostOfRevenue | 274,275 us-gaap_CostOfRevenue | 268,901 us-gaap_CostOfRevenue | 255,152 us-gaap_CostOfRevenue | 259,528 us-gaap_CostOfRevenue | 258,480 us-gaap_CostOfRevenue | 1,144,757 us-gaap_CostOfRevenue | 1,042,061 us-gaap_CostOfRevenue | 980,532 us-gaap_CostOfRevenue
Selling, general and administrative expenses | 115,965 us-gaap_SellingGeneralAndAdministrativeExpense | 102,461 us-gaap_SellingGeneralAndAdministrativeExpense | 107,032 us-gaap_SellingGeneralAndAdministrativeExpense | 108,387 us-gaap_SellingGeneralAndAdministrativeExpense | 107,196 us-gaap_SellingGeneralAndAdministrativeExpense | 94,513 us-gaap_SellingGeneralAndAdministrativeExpense | 96,325 us-gaap_SellingGeneralAndAdministrativeExpense | 96,647 us-gaap_SellingGeneralAndAdministrativeExpense | 433,845 us-gaap_SellingGeneralAndAdministrativeExpense | 394,681 us-gaap_SellingGeneralAndAdministrativeExpense | 378,016 us-gaap_SellingGeneralAndAdministrativeExpense
Special charges | 1,628 fcn_SpecialChargesAmount | 5,347 fcn_SpecialChargesAmount | 9,364 fcn_SpecialChargesAmount |  | 27,568 fcn_SpecialChargesAmount | 10,419 fcn_SpecialChargesAmount |  | 427 fcn_SpecialChargesAmount | 16,339 fcn_SpecialChargesAmount | 38,414 fcn_SpecialChargesAmount | 29,557 fcn_SpecialChargesAmount
Acquisition-related contingent consideration | (85)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 257 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (5)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (1,843)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (4,778)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 630 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (7,452)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 731 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (1,676)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (10,869)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (3,064)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Amortization of other intangible assets | 4,055 us-gaap_AmortizationOfIntangibleAssets | 3,398 us-gaap_AmortizationOfIntangibleAssets | 3,452 us-gaap_AmortizationOfIntangibleAssets | 4,616 us-gaap_AmortizationOfIntangibleAssets | 5,661 us-gaap_AmortizationOfIntangibleAssets | 5,776 us-gaap_AmortizationOfIntangibleAssets | 5,953 us-gaap_AmortizationOfIntangibleAssets | 5,564 us-gaap_AmortizationOfIntangibleAssets | 15,521 us-gaap_AmortizationOfIntangibleAssets | 22,954 us-gaap_AmortizationOfIntangibleAssets | 22,407 us-gaap_AmortizationOfIntangibleAssets
Goodwill impairment charge |  |  |  |  |  | 83,752 us-gaap_GoodwillImpairmentLoss |  |  |  | 83,752 us-gaap_GoodwillImpairmentLoss | 110,387 us-gaap_GoodwillImpairmentLoss
Costs and Expenses | 403,252 us-gaap_CostsAndExpenses | 404,707 us-gaap_CostsAndExpenses | 415,392 us-gaap_CostsAndExpenses | 385,435 us-gaap_CostsAndExpenses | 404,548 us-gaap_CostsAndExpenses | 450,242 us-gaap_CostsAndExpenses | 354,354 us-gaap_CostsAndExpenses | 361,849 us-gaap_CostsAndExpenses | 1,608,786 us-gaap_CostsAndExpenses | 1,570,993 us-gaap_CostsAndExpenses | 1,517,835 us-gaap_CostsAndExpenses
Operating income (loss) | 21,906 us-gaap_OperatingIncomeLoss | 46,471 us-gaap_OperatingIncomeLoss | 38,932 us-gaap_OperatingIncomeLoss | 40,117 us-gaap_OperatingIncomeLoss | 11,450 us-gaap_OperatingIncomeLoss | (35,599)us-gaap_OperatingIncomeLoss | 60,259 us-gaap_OperatingIncomeLoss | 45,329 us-gaap_OperatingIncomeLoss | 147,426 us-gaap_OperatingIncomeLoss | 81,439 us-gaap_OperatingIncomeLoss | 59,036 us-gaap_OperatingIncomeLoss
Interest income and other | 1,205 us-gaap_InterestAndOtherIncome | 1,014 us-gaap_InterestAndOtherIncome | 1,448 us-gaap_InterestAndOtherIncome | 1,003 us-gaap_InterestAndOtherIncome | 46 us-gaap_InterestAndOtherIncome | 1,152 us-gaap_InterestAndOtherIncome | (387)us-gaap_InterestAndOtherIncome | 937 us-gaap_InterestAndOtherIncome | 4,670 us-gaap_InterestAndOtherIncome | 1,748 us-gaap_InterestAndOtherIncome | 5,659 us-gaap_InterestAndOtherIncome
Interest expense | (12,488)us-gaap_InterestExpense | (12,634)us-gaap_InterestExpense | (12,908)us-gaap_InterestExpense | (12,655)us-gaap_InterestExpense | (12,776)us-gaap_InterestExpense | (12,814)us-gaap_InterestExpense | (13,071)us-gaap_InterestExpense | (12,715)us-gaap_InterestExpense | (50,685)us-gaap_InterestExpense | (51,376)us-gaap_InterestExpense | (56,731)us-gaap_InterestExpense
Income (loss) before income tax provision | 10,623 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 34,851 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 27,472 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 28,465 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (1,280)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (47,261)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 46,801 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 33,551 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 101,411 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 31,811 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,114 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision | 9,702 us-gaap_IncomeTaxExpenseBenefit | 12,329 us-gaap_IncomeTaxExpenseBenefit | 10,225 us-gaap_IncomeTaxExpenseBenefit | 10,348 us-gaap_IncomeTaxExpenseBenefit | 5,859 us-gaap_IncomeTaxExpenseBenefit | 3,360 us-gaap_IncomeTaxExpenseBenefit | 23,315 us-gaap_IncomeTaxExpenseBenefit | 9,871 us-gaap_IncomeTaxExpenseBenefit | 42,604 us-gaap_IncomeTaxExpenseBenefit | 42,405 us-gaap_IncomeTaxExpenseBenefit | 40,100 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | $ 921 us-gaap_NetIncomeLoss | $ 22,522 us-gaap_NetIncomeLoss | $ 17,247 us-gaap_NetIncomeLoss | $ 18,117 us-gaap_NetIncomeLoss | $ (7,139)us-gaap_NetIncomeLoss | $ (50,621)us-gaap_NetIncomeLoss | $ 23,486 us-gaap_NetIncomeLoss | $ 23,680 us-gaap_NetIncomeLoss | $ 58,807 us-gaap_NetIncomeLoss | $ (10,594)us-gaap_NetIncomeLoss | $ (36,986)us-gaap_NetIncomeLoss
Earnings (loss) per common share - basic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.43 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ (0.18)us-gaap_EarningsPerShareBasic | $ (1.29)us-gaap_EarningsPerShareBasic | $ 0.60 us-gaap_EarningsPerShareBasic | $ 0.60 us-gaap_EarningsPerShareBasic | $ 1.48 us-gaap_EarningsPerShareBasic | $ (0.27)us-gaap_EarningsPerShareBasic | $ (0.92)us-gaap_EarningsPerShareBasic
Earnings (loss) per common share - diluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.55 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ (0.18)us-gaap_EarningsPerShareDiluted | $ (1.29)us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 0.58 us-gaap_EarningsPerShareDiluted | $ 1.44 us-gaap_EarningsPerShareDiluted | $ (0.27)us-gaap_EarningsPerShareDiluted | $ (0.92)us-gaap_EarningsPerShareDiluted
Basic | 39,991 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,789 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,681 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,438 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,115 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,094 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,143 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,403 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,726 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,188 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 40,316 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 41,090 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,819 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,750 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,457 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,115 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,094 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,620 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,729 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 39,188 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,316 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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