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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Advisory fees	$ 56,114	$ 55,931	$ 109,376	$ 116,546
Settlement gain	6,909		6,909
Other income	405	50	1,742	313
Total revenues	63,428	55,981	118,027	116,859
Income/(loss) before taxes
Total income before taxes	22,225	11,156	37,047	32,828
U.S. Business segment [Member]
Revenues
Advisory fees	53,641	54,061	104,667	113,153
Settlement gain	6,909		6,909
Other income	508	387	1,820	608
Total revenues	61,058	54,448	113,396	113,761
Income/(loss) before taxes
Total income before taxes	25,310	20,084	43,218	44,294
International Business Segment [Member]
Revenues
Advisory fees	2,473	1,870	4,709	3,393
Other loss	(103)	(337)	(78)	(295)
Total revenues	2,370	1,533	4,631	3,098
Income/(loss) before taxes
Total income before taxes	$ (3,085)	$ (8,928)	$ (6,171)	$ (11,466)

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
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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+ References

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- Definition

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

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-Topic 942
-SubTopic 225
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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).

+ References

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