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Business Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
sources
Segment
Mar. 31, 2013
Segment Reporting Information    
Number of reportable segments (segments) 1  
Number of principal sources of revenue (source of revenue) 2  
Advisory revenues $ 48,455 $ 81,447
Investment revenues (losses) (4,886) (1,856)
Revenues as a percentage of total revenue (percent) 100.00% 100.00%
Total revenues $ 43,569 $ 79,591
Advisory revenues
   
Segment Reporting Information    
Revenues as a percentage of total revenue (percent) 111.00% 102.00%
Investment Revenues
   
Segment Reporting Information    
Revenues as a percentage of total revenue (percent) (11.00%) (2.00%)