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Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 454,324	$ 414,613	$ 879,876	$ 821,791
Adjusted Segment EBITDA	80,385	79,510	150,937	154,870
Corporate Finance / Restructuring
Segment Reporting Information [Line Items]
Revenues	104,020	96,714	198,002	195,794
Adjusted Segment EBITDA	19,133	17,848	30,084	36,933
Forensic and Litigation Consulting
Segment Reporting Information [Line Items]
Revenues	119,081	105,120	240,510	205,844
Adjusted Segment EBITDA	22,271	18,752	48,765	31,563
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	117,227	111,014	224,078	226,208
Adjusted Segment EBITDA	18,043	20,803	31,073	46,997
Technology
Segment Reporting Information [Line Items]
Revenues	60,720	51,196	120,783	97,900
Adjusted Segment EBITDA	15,104	16,888	32,452	30,604
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	53,276	50,569	96,503	96,045
Adjusted Segment EBITDA	$ 5,834	$ 5,219	$ 8,563	$ 8,773