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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2011
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Accounts Payable and Accrued Liabilities
Dec. 31, 2013
2013 Acquisitions
Dec. 31, 2013
Series of Individually Immaterial Business Acquisitions
Dec. 31, 2012
Corporate Finance Segment
Oct. 31, 2012
Corporate Finance Segment
Mar. 31, 2012
Corporate Finance Segment
Mar. 31, 2011
Customer Relationships
Business Acquisition [Line Items]                            
Consideration related to acquired businesses, goodwill adjustment         $ 15,000,000 $ 18,600,000                
Common stock consideration in relation to price protection provision guarantees         4,100,000                  
Acquisition-related stock price guarantees, outstanding         0                  
Initial consideration 30,000,000 15,200,000 26,700,000 9,100,000             11,100,000 27,400,000 3,100,000  
Number of acquisitions completed   2 2                      
Contingent consideration payable due date   Through 2014                        
Contingent consideration is payment period     5 years                      
Contingent consideration payment, due date       Dec. 31, 2017                    
Contingent consideration cap amount       8,000,000                    
Purchase price allocation, identifiable intangible assets   17,200,000     17,200,000         9,500,000        
Good will 14,800,000 1,218,733,000     1,218,733,000 1,260,035,000 1,309,358,000   38,900,000 10,100,000 7,800,000 18,400,000 2,200,000  
Purchase price allocation, Acquisition-related contingent consideration               12,600,000   4,700,000        
Purchase price allocation, deferred tax liability                   1,200,000        
Aggregate cash and stock consideration                     9,800,000 25,400,000    
Contingent consideration, estimated fair value 2,900,000                   1,300,000 2,100,000 1,100,000  
Purchase price allocation, identifiable intangible assets 6,300,000                   3,400,000 1,500,000 900,000  
Aggregate cash consideration 27,100,000                       2,000,000  
Purchase price allocation, accounts receivable 24,200,000                          
Purchase price allocation, assumed liabilities 20,600,000                          
Weighted average amortization period (in years)                           12 years 4 months 24 days
Acquisition-related costs             $ 1,500,000