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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Advisory fees	$ 57,574	$ 51,553	$ 166,950	$ 168,099
Settlement gain			6,909
Other income	412	236	2,154	549
Total revenues	57,986	51,789	176,013	168,648
Income/(loss) before taxes
Total income before taxes	15,496	14,225	52,543	47,053
U.S. Business segment [Member]
Revenues
Advisory fees	54,749	49,568	159,416	162,721
Settlement gain			6,909
Other income	590	323	2,410	931
Total revenues	55,339	49,891	168,735	163,652
Income/(loss) before taxes
Total income before taxes	18,493	17,032	61,712	61,326
International Business Segment [Member]
Revenues
Advisory fees	2,825	1,985	7,534	5,378
Other loss	(178)	(87)	(256)	(382)
Total revenues	2,647	1,898	7,278	4,996
Income/(loss) before taxes
Total income before taxes	$ (2,997)	$ (2,807)	$ (9,169)	$ (14,273)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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+ References

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Amount of fees earned from providing investment advice and research to customers.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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