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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Advisory fees	$ 227,775	$ 218,465	$ 297,944
Settlement gain	6,909
Other income	2,715	981	998
Total revenues	237,399	219,446	298,942
Income/(loss) before taxes
Total income before taxes	58,192	55,562	137,185
U.S. Business segment [Member]
Revenues
Advisory fees	217,021	211,066	293,788
Settlement gain	6,909
Other income	2,949	1,424	931
Total revenues	226,879	212,490	294,719
Income/(loss) before taxes
Total income before taxes	70,537	74,721	146,335
International Business Segment [Member]
Revenues
Advisory fees	10,754	7,399	4,156
Other (loss)/income	(234)	(443)	67
Total revenues	10,520	6,956	4,223
Income/(loss) before taxes
Total income before taxes	$ (12,345)	$ (19,159)	$ (9,150)

X

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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