Supplemental Condensed Consolidating Guarantor And Non-Guarantor Financial Information (Condensed Consolidating Statement Of Income) (Details) (USD $) In Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010		Sep. 30, 2011	Sep. 30, 2010		Dec. 31, 2010
Revenues	$ 413,802	$ 346,140	[1]	$ 1,176,055	$ 1,045,213	[1]
Direct cost of revenues	249,975	206,831	[1]	723,903	617,640	[1]
Selling, general and administrative expense	98,562	86,115	[1]	282,902	253,196	[1]
Special charges				15,212	29,356	[1]	51,100
Amortization of other intangible assets	5,843	6,286	[1]	16,795	18,229	[1]
Operating income	59,422	46,908	[1]	137,243	126,792	[1]
Other (expense) income	(13,833)	(14,538)	[1]	(38,720)	(35,021)	[1]
Income (loss) before income tax provision	45,589	32,370	[1]	98,523	91,771	[1]
Income tax (benefit) provision	16,150	12,206	[1]	34,501	34,642	[1]
Net income	29,439	20,164	[1]	64,022	57,129	[1]
FTI Consulting, Inc. [Member]
Revenues	157,053	126,096		427,804	388,355
Direct cost of revenues	99,635	74,811		281,576	233,467
Selling, general and administrative expense	43,053	36,458		119,639	110,917
Special charges				8,561	17,669
Amortization of other intangible assets	1,467	698		2,346	2,118
Operating income	12,898	14,129		15,682	24,184
Other (expense) income	(14,067)	(15,134)		(39,747)	(35,584)
Income (loss) before income tax provision	(1,169)	(1,005)		(24,065)	(11,400)
Income tax (benefit) provision	209	(4,067)		(9,998)	(4,788)
Equity in net earnings of subsidiaries	30,817	17,102		78,089	63,741
Net income	29,439	20,164		64,022	57,129
Guarantor Subsidiaries [Member]
Revenues	253,165	284,454		760,553	887,300
Direct cost of revenues	181,359	221,606		545,080	688,992
Selling, general and administrative expense	31,347	34,287		96,038	99,656
Special charges				228	10,842
Amortization of other intangible assets	2,667	3,912		9,526	11,933
Operating income	37,792	24,649		109,681	75,877
Other (expense) income	(1,890)	3,627		(1,333)	8,369
Income (loss) before income tax provision	35,902	28,276		108,348	84,246
Income tax (benefit) provision	15,082	12,949		45,216	36,119
Equity in net earnings of subsidiaries	(8,498)	1,497		(4,121)	14,463
Net income	12,322	16,824		59,011	62,590
Non-Guarantor Subsidiaries [Member]
Revenues	103,795	78,860		284,186	225,294
Direct cost of revenues	66,111	51,209		185,699	144,085
Selling, general and administrative expense	27,243	17,845		75,261	49,455
Special charges				6,423	845
Amortization of other intangible assets	1,709	1,676		4,923	4,178
Operating income	8,732	8,130		11,880	26,731
Other (expense) income	2,124	(3,031)		2,360	(7,806)
Income (loss) before income tax provision	10,856	5,099		14,240	18,925
Income tax (benefit) provision	859	3,324		(717)	3,311
Equity in net earnings of subsidiaries		2,168			6,441
Net income	9,997	3,943		14,957	22,055
Eliminations [Member]
Revenues	(100,211)	(143,270)		(296,488)	(455,736)
Direct cost of revenues	(97,130)	(140,795)		(288,452)	(448,904)
Selling, general and administrative expense	(3,081)	(2,475)		(8,036)	(6,832)
Equity in net earnings of subsidiaries	(22,319)	(20,767)		(73,968)	(84,645)
Net income	$ (22,319)	$ (20,767)		$ (73,968)	$ (84,645)

[1] As Revised (Note 2)