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Business Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
sources
Segment
Sep. 30, 2013
Segment Reporting Information        
Number of reportable segments (segments)     1  
Number of principal sources of revenue (source of revenue)     2  
Advisory revenues $ 91,669 $ 46,983 $ 204,111 $ 211,496
Investment revenues (losses) 324 (2,440) (5,526) (672)
Revenues as a percentage of total revenue (percent) 100.00% 100.00% 100.00% 100.00%
Total revenues $ 91,993 $ 44,543 $ 198,585 $ 210,824
Advisory revenues
       
Segment Reporting Information        
Revenues as a percentage of total revenue (percent) 99.6478% 105.47785% 102.78269% 100.31875%
Investment Revenues
       
Segment Reporting Information        
Revenues as a percentage of total revenue (percent) 0.3522% (5.47785%) (2.78269%) (0.31875%)