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Acquisitions - Estimated Useful Lives of Identifiable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible asset estimated life 18 months 18 months
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible asset estimated life 13 years 13 years
Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible asset estimated life 7 years  
Powertrain Integration, LLC [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 13,600  
Powertrain Integration, LLC [Member] | Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 600  
Finite lived intangible asset estimated life 3 months  
Powertrain Integration, LLC [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 13,000  
Finite lived intangible asset estimated life 12 years  
Bi-Phase Technologies, LLC [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 860  
Bi-Phase Technologies, LLC [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 160  
Finite lived intangible asset estimated life 15 years  
Bi-Phase Technologies, LLC [Member] | Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 700  
Finite lived intangible asset estimated life 7 years  
Buck's Acquisition Company, LLC [Member] | Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total identifiable intangible assets $ 1,380  
Finite lived intangible asset estimated life 10 years