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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
Summary of significant accounting policies [line items]  
Business combination description Recognized assets and liabilities may be adjusted during a maximum of 12 months from the acquisition date, depending on new information obtained about the facts and circumstances existing at the acquisition date.
Technology [member]  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 20 years
Customer relationships [member]  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 25 years
Bottom of range [member] | Computer software [member]  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 3 years
Bottom of range [member] | Buildings [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 10 years
Bottom of range [member] | Machinery and equipment [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 3 years
Bottom of range [member] | Vehicles [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 5 years
Top of range [member] | Computer software [member]  
Summary of significant accounting policies [line items]  
Intangible assets amortized estimated useful life 5 years
Top of range [member] | Buildings [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 50 years
Top of range [member] | Machinery and equipment [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 40 years
Top of range [member] | Vehicles [member]  
Summary of significant accounting policies [line items]  
Property, plant and equipment, useful life 8 years