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Special Charges - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Position
Sep. 30, 2014
Sep. 30, 2013
Special Charges [Line Items]        
Special charges $ 5,347,000 $ 10,419,000 $ 14,711,000 $ 10,846,000
Post-employment payments 4,500,000   4,500,000  
Updated forecasts of expected sublease income for segment offices previously vacated 800,000      
Non cash special charges   3,100,000   3,100,000
Number of employees included in the reduction in workforce related to the special charges   45    
Total cash outflow associated with special charges, amount paid     63,500,000  
Cash outflow associated with special charges, amount paid     44,200,000  
Cash outflow associated with special charges, amount expected to be paid in 2014     2,100,000  
Cash outflow associated with special charges, amount expected to be paid in 2015     5,100,000  
Cash outflow associated with special charges, amount expected to be paid in 2016     3,200,000  
Cash outflow associated with special charges, amount expected to be paid in 2017     3,100,000  
Cash outflow associated with special charges, amount expected to be paid from 2018 to 2025     5,800,000  
Plane Lease Termination
        
Special Charges [Line Items]        
Special charges     7,900,000 600,000
Number of office locations       1
Closure of West Palm Beach Executive Office
        
Special Charges [Line Items]        
Special charges     2,300,000  
Non cash special charges     700,000  
Salary continuance and other contractual employee related costs
        
Special Charges [Line Items]        
Special charges       $ 10,200,000