Supplemental Condensed Consolidating Guarantor and Non-Guarantor Financial Information Condensed Consolidating Statement Of Cash Flow (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net cash (used in) provided by operating activities	$ 19,369	$ (57,288)
Investing activities
Payments for acquisition of businesses, net of cash received	(40,512)	(21,550)
Purchases of property and equipment	(14,130)	(13,728)
Other	21	93
Net cash used in investing activities	(54,621)	(35,185)
Financing activities
Payments of long-term debt and capital lease obligations		(1,974)
Issuance of common stock and other	438	(2,235)
Purchase and retirement of common stock	(28,758)
Excess tax benefits from share-based compensation	191	71
Net cash provided by (used in) financing activities	(28,129)	(4,138)
Effect of exchange rate changes on cash and cash equivalents	(850)	(1,831)
Net decrease in cash and cash equivalents	(64,231)	(98,442)
Cash and cash equivalents, beginning of period	156,785	264,423
Cash and cash equivalents, end of period	92,554	165,981
FTI Consulting, Inc.
Operating activities
Net cash (used in) provided by operating activities	(59,591)	(70,726)
Investing activities
Payments for acquisition of businesses, net of cash received	(11,601)	(21,186)
Purchases of property and equipment	(1,505)	(3,384)
Other	21	93
Net cash used in investing activities	(13,085)	(24,477)
Financing activities
Payments of long-term debt and capital lease obligations		(1,929)
Issuance of common stock and other	1,083	(948)
Purchase and retirement of common stock	(28,758)
Excess tax benefits from share-based compensation	191	71
Intercompany transfers	53,168	8,906
Net cash provided by (used in) financing activities	25,684	6,100
Net decrease in cash and cash equivalents	(46,992)	(89,103)
Cash and cash equivalents, beginning of period	66,663	161,180
Cash and cash equivalents, end of period	19,671	72,077
Guarantor Subsidiaries
Operating activities
Net cash (used in) provided by operating activities	50,836	336
Investing activities
Payments for acquisition of businesses, net of cash received	(7,157)
Purchases of property and equipment	(10,386)	(8,350)
Net cash used in investing activities	(17,543)	(8,350)
Financing activities
Payments of long-term debt and capital lease obligations		(45)
Intercompany transfers	(33,595)	7,955
Net cash provided by (used in) financing activities	(33,595)	7,910
Net decrease in cash and cash equivalents	(302)	(104)
Cash and cash equivalents, beginning of period	610	197
Cash and cash equivalents, end of period	308	93
Non-Guarantor Subsidiaries
Operating activities
Net cash (used in) provided by operating activities	28,124	13,102
Investing activities
Payments for acquisition of businesses, net of cash received	(21,754)	(364)
Purchases of property and equipment	(2,239)	(1,994)
Net cash used in investing activities	(23,993)	(2,358)
Financing activities
Issuance of common stock and other	(645)	(1,287)
Intercompany transfers	(19,573)	(16,861)
Net cash provided by (used in) financing activities	(20,218)	(18,148)
Effect of exchange rate changes on cash and cash equivalents	(850)	(1,831)
Net decrease in cash and cash equivalents	(16,937)	(9,235)
Cash and cash equivalents, beginning of period	89,512	103,046
Cash and cash equivalents, end of period	$ 72,575	$ 93,811