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Special Charges - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Special Charges [Line Items]              
Special charges $ 0 $ 5,347 $ 0 $ 14,711      
Post-employment payments   4,500   4,500      
Updated forecasts of expected sublease income for segment offices previously vacated   $ 800          
Restructuring charge, non-cash       700      
Total cash outflow associated with special charges, amount paid         $ 65,100 $ 65,100 $ 65,100
Cash outflow associated with special charges, amount paid     52,300        
Cash outflow associated with special charges, amount expected to be paid in 2015     1,000        
Cash outflow associated with special charges, amount expected to be paid in 2016     3,300        
Cash outflow associated with special charges, amount expected to be paid in 2017     3,100        
Cash outflow associated with special charges, amount expected to be paid in 2018     2,700        
Cash outflow associated with special charges, amount expected to be paid from 2019 to 2025     $ 2,700        
Lease Termination              
Special Charges [Line Items]              
Special charges       7,900      
Closure of West Palm Beach Executive Office              
Special Charges [Line Items]              
Special charges       $ 2,300