Property, Plant and Equipment - Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 1,599,287	$ 1,355,087
Accumulated depreciation	(647,109)	(522,818)
Property, Plant and Equipment, Net, Total	952,178	832,269
Land and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	73,419	71,002
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	305,231	265,824
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	1,022,279	864,337
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 198,358	$ 153,924
Minimum [Member] | Land and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Minimum [Member] | Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Minimum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Maximum [Member] | Land and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	25 years
Maximum [Member] | Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Maximum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years