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Special Charges - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Special charges $ 0 $ 40,885 $ 10,445
Employee Severance      
Restructuring Cost and Reserve [Line Items]      
Special charges   23,500  
Contract Termination      
Restructuring Cost and Reserve [Line Items]      
Special charges   14,400  
Other Restructuring      
Restructuring Cost and Reserve [Line Items]      
Special charges   $ 3,000