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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Advisory fees	$ 218,465	$ 297,944	$ 182,816
Other income	981	998	946
Total revenues	219,446	298,942	183,762
Income/(loss) before taxes
Total income before taxes	55,562	137,185	73,548
U.S. Business segment [Member]
Revenues
Advisory fees	211,066	293,788	181,987
Other income	1,424	931	960
Total revenues	212,490	294,719	182,947
Income/(loss) before taxes
Total income before taxes	74,721	146,335	78,631
International Business Segment [Member]
Revenues
Advisory fees	7,399	4,156	829
Other income	(443)	67	(14)
Total revenues	6,956	4,223	815
Income/(loss) before taxes
Total income before taxes	$ (19,159)	$ (9,150)	$ (5,083)

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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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