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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,299,949	$ 1,281,567
Less accumulated depreciation and amortization	325,701	267,529
Property, plant and equipment, net	974,248	1,014,038
Machinery, Equipment and Automotive [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,189,438	1,163,532
Machinery, Equipment and Automotive [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Machinery, Equipment and Automotive [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	30 years
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 39,032	42,886
Buildings and Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Buildings and Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	30 years
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 8,076	8,111
Land Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Land Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	40 years
Furniture, Fixtures and Store Equipment [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Property, plant and equipment, gross	$ 1,122	1,466
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	28,753	27,973
Capital Spare Parts [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	28,945	29,835
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,583	$ 7,764

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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