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Acquisitions - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2011
Customer Relationships
Jun. 30, 2012
Corporate Finance Segment
Jun. 30, 2012
FS Asia Advisory Limited
Business Acquisition [Line Items]              
Initial acquisition price           $ 1.9  
Acquisition-date fair value of the total consideration transferred       30.0      
Aggregate cash consideration       27.0      
Contingent consideration estimated fair value       2.9      
Purchase price allocation, accounts receivable       24.2      
Purchase price allocation, assumed liabilities       20.6      
Purchase price allocation, identifiable intangible assets       6.3      
Purchase price allocation, goodwill       14.8      
Acquisition-related costs     1.5        
Weighted average amortization period (in years)         12 years 4 months 24 days    
Acquisition-related contingent consideration 4.1 4.1         4.1
Common stock consideration in relation to price protection provision guarantees $ 2.9 $ 3.6          
Stock floor prices for common stock price guarantee provisions, minimum   $ 56.66          
Stock floor prices for common stock price guarantee provisions, maximum   $ 69.48          
Determination dates for common stock price guarantee provisions   2013