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Special Charges - Additional Information (Detail) - Entity [Domain] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Special Charges [Line Items]              
Special charges $ 0 $ 9,364 $ 0 $ 9,364      
Non cash special charges   600          
Total cash outflow associated with special charges, amount paid         $ 65,100 $ 65,100 $ 65,100
Cash outflow associated with special charges, amount paid     50,800        
Cash outflow associated with special charges, amount expected to be paid in 2015     2,200        
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     $ 3,000        
Lease Termination              
Special Charges [Line Items]              
Special charges   7,900          
Closure of West Palm Beach Executive Office              
Special Charges [Line Items]              
Special charges   $ 1,500