Supplemental Condensed Consolidating Guarantor and Non-Guarantor Financial Information Condensed Consolidating Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 92,554	$ 156,785	$ 165,981	$ 264,423
Restricted cash		1,190
Accounts receivable, net	480,032	429,240
Other current assets	92,191	87,160
Total current assets	664,777	674,375
Property and equipment, net	65,607	68,192
Goodwill	1,263,166	1,260,035
Other intangible assets, net	101,675	104,181
Other assets	175,656	168,669
Total assets	2,270,881	2,275,452
Liabilities
Other current liabilities	261,778	304,197
Total current liabilities	261,778	304,197
Long-term debt, net	717,000	717,024
Other liabilities	212,536	185,999
Total liabilities	1,191,314	1,207,220
Stockholders' equity	1,079,567	1,068,232
Total liabilities and stockholders' equity	2,270,881	2,275,452
FTI Consulting, Inc.
Assets
Cash and cash equivalents	19,671	66,663	72,077	161,180
Accounts receivable, net	149,013	140,254
Intercompany receivables		7,053
Other current assets	52,287	46,978
Total current assets	220,971	260,948
Property and equipment, net	33,641	37,411
Goodwill	559,519	558,473
Other intangible assets, net	35,754	36,826
Investments in subsidiaries	1,768,811	1,631,243
Other assets	96,327	85,109
Total assets	2,715,023	2,610,010
Liabilities
Intercompany payables	648,931	549,339
Other current liabilities	90,049	118,865
Total current liabilities	738,980	668,204
Long-term debt, net	700,000	700,024
Other liabilities	196,476	173,550
Total liabilities	1,635,456	1,541,778
Stockholders' equity	1,079,567	1,068,232
Total liabilities and stockholders' equity	2,715,023	2,610,010
Guarantor Subsidiaries
Assets
Cash and cash equivalents	308	610	93	197
Accounts receivable, net	186,230	149,253
Intercompany receivables	729,235	674,136
Other current assets	19,289	20,469
Total current assets	935,062	844,468
Property and equipment, net	18,683	16,477
Goodwill	425,864	418,789
Other intangible assets, net	23,797	23,975
Investments in subsidiaries	511,827	502,954
Other assets	62,491	66,170
Total assets	1,977,724	1,872,833
Liabilities
Intercompany payables	67,108	112,137
Other current liabilities	85,967	79,533
Total current liabilities	153,075	191,670
Long-term debt, net	17,000	17,000
Other liabilities	20,690	10,479
Total liabilities	190,765	219,149
Stockholders' equity	1,786,959	1,653,684
Total liabilities and stockholders' equity	1,977,724	1,872,833
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	72,575	89,512	93,811	103,046
Restricted cash		1,190
Accounts receivable, net	144,789	139,733
Intercompany receivables		23,185
Other current assets	20,615	19,713
Total current assets	237,979	273,333
Property and equipment, net	13,283	14,304
Goodwill	277,783	282,773
Other intangible assets, net	72,129	74,967
Other assets	27,766	28,318
Total assets	628,940	673,695
Liabilities
Intercompany payables	13,196	42,898
Other current liabilities	85,762	105,799
Total current liabilities	98,958	148,697
Other liabilities	6,298	12,898
Total liabilities	105,256	161,595
Stockholders' equity	523,684	512,100
Total liabilities and stockholders' equity	628,940	673,695
Eliminations
Assets
Intercompany receivables	(729,235)	(704,374)
Total current assets	(729,235)	(704,374)
Other intangible assets, net	(30,005)	(31,587)
Investments in subsidiaries	(2,280,638)	(2,134,197)
Other assets	(10,928)	(10,928)
Total assets	(3,050,806)	(2,881,086)
Liabilities
Intercompany payables	(729,235)	(704,374)
Total current liabilities	(729,235)	(704,374)
Other liabilities	(10,928)	(10,928)
Total liabilities	(740,163)	(715,302)
Stockholders' equity	(2,310,643)	(2,165,784)
Total liabilities and stockholders' equity	$ (3,050,806)	$ (2,881,086)