Supplemental Condensed Consolidating Guarantor and Non-Guarantor Financial Information Condensed Consolidating Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 283,680	$ 205,833	$ 156,785	$ 264,423
Accounts receivable, net	485,101	476,445
Other current assets	115,392	121,583
Total current assets	884,173	803,861
Property and equipment, net	82,163	79,007
Goodwill	1,211,689	1,218,733	1,260,035
Other intangible assets, net	77,034	97,148
Other assets	175,468	166,198
Total assets	2,430,527	2,364,947
Liabilities
Other current liabilities	367,092	384,330
Total current liabilities	367,092	384,330
Long-term debt, net	700,000	711,000
Other liabilities	260,689	227,358
Total liabilities	1,327,781	1,322,688
Stockholders' equity	1,102,746	1,042,259	1,068,232	1,106,202
Total liabilities and stockholders' equity	2,430,527	2,364,947
FTI Consulting, Inc.
Assets
Cash and cash equivalents	171,090	111,943	66,663	161,180
Accounts receivable, net	153,495	154,357
Other current assets	74,455	68,292
Total current assets	399,040	334,592
Property and equipment, net	33,864	31,304
Goodwill	559,318	559,820
Other intangible assets, net	29,807	33,746
Investments in subsidiaries	1,915,869	1,772,130
Other assets	61,025	75,561
Total assets	2,998,923	2,807,153
Liabilities
Intercompany payables	832,253	709,628
Other current liabilities	148,299	154,049
Total current liabilities	980,552	863,677
Long-term debt, net	700,000	700,000
Other liabilities	215,625	201,217
Total liabilities	1,896,177	1,764,894
Stockholders' equity	1,102,746	1,042,259
Total liabilities and stockholders' equity	2,998,923	2,807,153
Guarantor Subsidiaries
Assets
Cash and cash equivalents	159	494	610	197
Accounts receivable, net	162,032	162,505
Intercompany receivables	875,000	820,158
Other current assets	22,994	20,932
Total current assets	1,060,185	1,004,089
Property and equipment, net	17,050	19,047
Goodwill	416,053	408,903
Other intangible assets, net	18,432	19,534
Investments in subsidiaries	484,162	498,001
Other assets	78,388	56,949
Total assets	2,074,270	2,006,523
Liabilities
Intercompany payables	14,197	74,813
Other current liabilities	113,450	114,883
Total current liabilities	127,647	189,696
Long-term debt, net		11,000
Other liabilities	14,955	15,009
Total liabilities	142,602	215,705
Stockholders' equity	1,931,668	1,790,818
Total liabilities and stockholders' equity	2,074,270	2,006,523
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	112,431	93,396	89,512	103,046
Accounts receivable, net	169,574	159,583
Intercompany receivables	12,195	18,881
Other current assets	17,943	32,359
Total current assets	312,143	304,219
Property and equipment, net	31,249	28,656
Goodwill	236,318	250,010
Other intangible assets, net	53,357	72,221
Other assets	36,055	33,688
Total assets	669,122	688,794
Liabilities
Intercompany payables	40,745	54,598
Other current liabilities	105,343	115,398
Total current liabilities	146,088	169,996
Other liabilities	30,109	11,132
Total liabilities	176,197	181,128
Stockholders' equity	492,925	507,666
Total liabilities and stockholders' equity	669,122	688,794
Eliminations
Assets
Intercompany receivables	(887,195)	(839,039)
Total current assets	(887,195)	(839,039)
Other intangible assets, net	(24,562)	(28,353)
Investments in subsidiaries	(2,400,031)	(2,270,131)
Total assets	(3,311,788)	(3,137,523)
Liabilities
Intercompany payables	(887,195)	(839,039)
Total current liabilities	(887,195)	(839,039)
Total liabilities	(887,195)	(839,039)
Stockholders' equity	(2,424,593)	(2,298,484)
Total liabilities and stockholders' equity	$ (3,311,788)	$ (3,137,523)