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Summary of Significant Accounting Policies - Estimated useful life of Property, Plant, and Equipment (Detail)
12 Months Ended
Dec. 31, 2017
Building [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 40 years
Minimum [Member] | Building Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 5 years
Minimum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 3 years
Minimum [Member] | Computer Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 3 years
Maximum [Member] | Building Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 14 years
Maximum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 8 years
Maximum [Member] | Computer Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, estimated useful life 6 years