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Summary of Significant Accounting Policies - Concentration Risk (Details)
 12 Months Ended
Dec. 31, 2013
Customer
Dec. 31, 2012
Customer concentration risk
    
Concentration risk:    
Number of major customers, Sales 2  
Accounts receivable | Customer concentration risk
    
Concentration risk:    
Number of major customers, Sales 3  
Concentration risk percentage 71.00% 75.00%
Sales | Customer concentration risk
    
Concentration risk:    
Number of major customers, Sales 2 2
Concentration risk percentage 68.00% 74.00%
Sales | Geographic concentration risk | Mexico and Canada
    
Concentration risk:    
Concentration risk percentage 34.00% 29.00%
Number of employees, geographic area | Labor force concentration risk
    
Concentration risk:    
Concentration risk, number of employees 1,458  
Number of employees, geographic area | Labor force concentration risk | Mexico
    
Concentration risk:    
Concentration risk, number of employees 770  
Number of employees, geographic area | Labor force concentration risk | United States
    
Concentration risk:    
Concentration risk, number of employees 688  
Workforce subject to collective bargaining arrangements | Unionized employees concentration risk
    
Concentration risk:    
Concentration risk, number of employees 1,458  
Workforce subject to collective bargaining arrangements | Unionized employees concentration risk | International Association of Machinists and Aerospace Workers
    
Concentration risk:    
Concentration risk, number of employees 281  
Workforce subject to collective bargaining arrangements | Unionized employees concentration risk | Sindicato de Jorneleros y Obreros
    
Concentration risk:    
Concentration risk, number of employees 670