Assets By Segments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total assets	$ 2,430,527	$ 2,364,947
Operating Segments
Segment Reporting Information [Line Items]
Total assets	2,058,144	2,077,922
Operating Segments | Corporate Finance / Restructuring
Segment Reporting Information [Line Items]
Total assets	668,631	669,027
Operating Segments | Forensic and Litigation Consulting
Segment Reporting Information [Line Items]
Total assets	430,759	444,850
Operating Segments | Economic Consulting
Segment Reporting Information [Line Items]
Total assets	493,694	487,549
Operating Segments | Technology
Segment Reporting Information [Line Items]
Total assets	214,866	208,612
Operating Segments | Strategic Communications
Segment Reporting Information [Line Items]
Total assets	250,194	267,884
Unallocated Corporate Assets
Segment Reporting Information [Line Items]
Total assets	$ 372,383	$ 287,025