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Summary of Significant Accounting Policies - Estimated Useful Lives of Major Classes of Depreciable Assets (Detail)
12 Months Ended
Dec. 31, 2017
Computer software | Minimum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 3 years
Computer software | Maximum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 5 years
Buildings  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 10 years
Buildings | Maximum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 50 years
Land improvements | Minimum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 15 years
Land improvements | Maximum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 40 years
Machinery and equipment | Minimum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 3 years
Machinery and equipment | Maximum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 15 years
Furniture and fixtures | Minimum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 15 years
Leasehold improvements | Maximum  
Property, Plant & Equipment [Line Items]  
Estimated useful lives 15 years