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Special Charges - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Special Charges [Line Items]          
Special charges $ 9,364,000 $ 400,000 $ 9,364,000 $ 427,000 $ 38,400,000
Non cash special charges 600,000       14,100,000
Total cash outflow associated with special charges, amount paid     57,300,000    
Cash outflow associated with special charges, amount paid     34,500,000    
Cash outflow associated with special charges, amount expected to be paid in 2014     6,200,000    
Cash outflow associated with special charges, amount expected to be paid in 2015     5,000,000    
Cash outflow associated with special charges, amount expected to be paid in 2016     3,100,000    
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     5,400,000    
Plane Lease Termination
          
Special Charges [Line Items]          
Special charges 7,900,000        
Closure of West Palm Beach Executive Office
          
Special Charges [Line Items]          
Special charges $ 1,500,000