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Business Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
sources
Segment
Mar. 31, 2012
Segment Reporting Information    
Advisory revenues $ 81,447 $ 73,255
Number of business segments 1  
Number of principal sources of revenue 2  
Advisory revenues as a percentage of total revenue 100.00% 100.00%
Investment Revenues (1,856) 9,435
Total Revenues $ 79,591 $ 82,690
Advisory revenues
   
Segment Reporting Information    
Advisory revenues as a percentage of total revenue 102.00% 89.00%
Investment Revenues [Member]
   
Segment Reporting Information    
Advisory revenues as a percentage of total revenue (2.00%) 11.00%