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Acquisitions - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2011
Customer Relationships
Dec. 31, 2012
Corporate Finance Segment
Oct. 31, 2012
Corporate Finance Segment
Mar. 31, 2012
Corporate Finance Segment
Sep. 30, 2010
2010 Acquisitions
Dec. 31, 2010
2010 Acquisitions
Jun. 30, 2010
2010 Acquisitions
Dec. 31, 2010
2010 Acquisitions
Customer Relationships
Dec. 31, 2010
2010 Acquisitions
Non-Competition Agreements
Business Acquisition [Line Items]                        
Purchase price allocation, goodwill $ 18.6 $ 27.3 $ 14.8       $ 31.6   $ 47.2 $ 2.6    
Common stock consideration in relation to price protection provision guarantees 4.2                      
Stock floor prices for common stock price guarantee provisions $ 54.33                      
Stock floor prices for common stock price guarantee provisions $ 69.48                      
Contingent consideration estimated fair value         10.0 25.4 1.1          
Contingent consideration payment, due date         Dec. 31, 2017 Dec. 31, 2017            
Contingent consideration cap amount         15.0 16.0     37.1      
Initial acquisition price             3.1 86.4   2.8    
Aggregate cash consideration     27.1       2.0 20.2   2.3    
Purchase price allocation, identifiable intangible assets     6.3       6.5   6.9 0.2 5.8 1.3
Acquisition-date fair value of the total consideration transferred     30.0                  
Contingent consideration estimated fair value     2.9         18.2   0.5    
Purchase price allocation, accounts receivable     24.2                  
Purchase price allocation, assumed liabilities     20.6                  
Acquisition-related costs   1.5                    
Weighted average amortization period (in years)       12 years 4 months 24 days             5 years 6 years
Cash held in escrow               8.6        
Loan notes to selling shareholders               35.0        
Reimbursement of seller expenses               $ 0.6        
Beginning of term of contingent consideration payable annually                 2010      
End of term of contingent consideration payable annually                 2015