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Special Charges - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Special charges $ 0 $ 0 $ 0 $ 30,074,000
Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Special charges       16,100,000
Contract Termination        
Restructuring Cost and Reserve [Line Items]        
Special charges       12,400,000
Other Restructuring        
Restructuring Cost and Reserve [Line Items]        
Special charges       $ 1,600,000