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Summary of Significant Accounting Policies - Risks and Uncertainties and Use of Estimates (Details)
 12 Months Ended
Dec. 31, 2016
employee
customer
Dec. 31, 2015
customer
Dec. 31, 2014
customer
Segment Reporting Information [Line Items]      
Number of employees 8,500    
Percent of employees located outside of the U.S. 15.00%    
Percent of employees covered by collective bargaining agreements 40.00%    
Sales Revenue [Member]      
Segment Reporting Information [Line Items]      
Number of customers | customer 0 0 0
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member]      
Segment Reporting Information [Line Items]      
Number of employees 800