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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2014 | Jun. 06, 2012
Stockholders Equity [Line Items] |  |  |  |  |
Value of shares that have been repurchased and retired during the period |  | $ 71,130,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 50,032,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
Payment for share repurchase | 4,367,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 66,763,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 50,032,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Stock Repurchase Plan |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Board of Directors authorized stock repurchase program |  |  |  |  | 250,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Number of shares that have been repurchased and retired during the period | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember | 1,956,900 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |  |  |
Average price per share |  | $ 36.35 us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |  |  |
Value of shares that have been repurchased and retired during the period |  | 71,100,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |  |  |
Stock repurchase program, period | 2 years |  |  |  |
Payment for share repurchase |  | 66,700,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |  | 4,400,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |
Accrued liability related to repurchase of share | $ 0 fcn_AccruedRepurchaseStockPayable / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember | $ 4,400,000 fcn_AccruedRepurchaseStockPayable / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember |  |  |

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- Definition Accrued amount for stock repurchase transactions. + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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