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Business Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
sources
Segment
Sep. 30, 2012
Segment Reporting Information        
Number of reportable segments (segments)     1  
Number of principal sources of revenue (source of revenue)     2  
Advisory revenues $ 46,983 $ 72,757 $ 211,496 $ 191,160
Total investment revenues (2,440) (10,010) (672) 1,594
Advisory revenues as a percentage of total revenue (percent) 100.00% 100.00% 100.00% 100.00%
Total Revenues $ 44,543 $ 62,747 $ 210,824 $ 192,754
Advisory revenues
       
Segment Reporting Information        
Advisory revenues as a percentage of total revenue (percent) 105.00% 116.00% 100.00% 99.00%
Investment Revenues [Member]
       
Segment Reporting Information        
Advisory revenues as a percentage of total revenue (percent) (5.00%) (16.00%) 0.00% 1.00%