Accounting Policies - Schedule of Range of Estimated Service Lives (Detail)	12 Months Ended
	Dec. 31, 2018
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	15 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	5 years
Minimum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	3 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	45 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	40 years
Maximum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	25 years