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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Advisory fees	$ 53,262	$ 60,615
Other income	1,337	263
Total revenues	54,599	60,878
Income/(loss) before taxes
Total income before taxes	14,822	21,672
U.S. Business segment [Member]
Revenues
Advisory fees	51,026	59,092
Other income	1,312	221
Total revenues	52,338	59,313
Income/(loss) before taxes
Total income before taxes	17,908	24,210
International Business Segment [Member]
Revenues
Advisory fees	2,236	1,523
Other income	25	42
Total revenues	2,261	1,565
Income/(loss) before taxes
Total income before taxes	$ (3,086)	$ (2,538)

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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

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