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Stockholders' Equity (Details) (USD $)
0 Months Ended1 Months Ended9 Months Ended12 Months Ended
Sep. 08, 2011
May 17, 2011
Mar. 07, 2011
Nov. 30, 2009
Sep. 30, 2011
Dec. 31, 2010
Mar. 02, 2011
Stockholders' Equity [Abstract]       
Board of directors authorized stock repurchase program   $ 500,000,000   
Stock repurchase program terminated   50,000,000   
Stock repurchase program repurchases    209,400,000290,600,000 
Repurchased shares of FTI Consulting common stock671,6475,061,5584,433,671 5,733,2056,633,680 
Accelerated stock buyback209,400,000    250,000,000209,400,000
Remaining stock repurchase program     $ 209,400,000