Supplemental Condensed Consolidating Guarantor and Non-Guarantor Financial Information Condensed Consolidating Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 100,703	$ 156,785	$ 182,438	$ 264,423
Restricted cash	1,118	1,190
Accounts receivable, net	470,596	429,240
Other current assets	79,312	87,160
Total current assets	651,729	674,375
Property and equipment, net	66,706	68,192
Goodwill	1,252,440	1,260,035
Other intangible assets, net	101,858	104,181
Other assets	166,719	168,669
Total assets	2,239,452	2,275,452
Liabilities
Other current liabilities	269,245	304,197
Total current liabilities	269,245	304,197
Long-term debt, net	717,024	717,024
Other liabilities	194,855	185,999
Total liabilities	1,181,124	1,207,220
Stockholders' equity	1,058,328	1,068,232
Total liabilities and stockholders' equity	2,239,452	2,275,452
FTI Consulting, Inc.
Assets
Cash and cash equivalents	28,041	66,663	90,484	161,180
Accounts receivable, net	160,897	140,254
Intercompany receivables		7,053
Other current assets	42,003	46,978
Total current assets	230,941	260,948
Property and equipment, net	35,457	37,411
Goodwill	559,474	558,473
Other intangible assets, net	36,399	36,826
Investments in subsidiaries	1,732,702	1,631,243
Other assets	86,998	85,109
Total assets	2,681,971	2,610,010
Liabilities
Intercompany payables	647,041	549,339
Other current liabilities	96,740	118,865
Total current liabilities	743,781	668,204
Long-term debt, net	700,024	700,024
Other liabilities	179,838	173,550
Total liabilities	1,623,643	1,541,778
Stockholders' equity	1,058,328	1,068,232
Total liabilities and stockholders' equity	2,681,971	2,610,010
Guarantor Subsidiaries
Assets
Cash and cash equivalents	281	610	112	197
Accounts receivable, net	169,988	149,253
Intercompany receivables	692,705	674,136
Other current assets	18,398	20,469
Total current assets	881,372	844,468
Property and equipment, net	17,731	16,477
Goodwill	426,108	418,789
Other intangible assets, net	23,528	23,975
Investments in subsidiaries	484,160	502,954
Other assets	64,559	66,170
Total assets	1,897,458	1,872,833
Liabilities
Intercompany payables	39,162	112,137
Other current liabilities	73,601	79,533
Total current liabilities	112,763	191,670
Long-term debt, net	17,000	17,000
Other liabilities	15,071	10,479
Total liabilities	144,834	219,149
Stockholders' equity	1,752,624	1,653,684
Total liabilities and stockholders' equity	1,897,458	1,872,833
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	72,381	89,512	91,842	103,046
Restricted cash	1,118	1,190
Accounts receivable, net	139,711	139,733
Intercompany receivables	4,368	23,185
Other current assets	18,911	19,713
Total current assets	236,489	273,333
Property and equipment, net	13,518	14,304
Goodwill	266,858	282,773
Other intangible assets, net	72,725	74,967
Other assets	26,090	28,318
Total assets	615,680	673,695
Liabilities
Intercompany payables	10,870	42,898
Other current liabilities	98,904	105,799
Total current liabilities	109,774	148,697
Other liabilities	10,874	12,898
Total liabilities	120,648	161,595
Stockholders' equity	495,032	512,100
Total liabilities and stockholders' equity	615,680	673,695
Eliminations
Assets
Intercompany receivables	(697,073)	(704,374)
Total current assets	(697,073)	(704,374)
Other intangible assets, net	(30,794)	(31,587)
Investments in subsidiaries	(2,216,862)	(2,134,197)
Other assets	(10,928)	(10,928)
Total assets	(2,955,657)	(2,881,086)
Liabilities
Intercompany payables	(697,073)	(704,374)
Total current liabilities	(697,073)	(704,374)
Other liabilities	(10,928)	(10,928)
Total liabilities	(708,001)	(715,302)
Stockholders' equity	(2,247,656)	(2,165,784)
Total liabilities and stockholders' equity	$ (2,955,657)	$ (2,881,086)