Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,316,635	$ 1,313,245
Less accumulated depreciation and amortization	425,437	376,771
Property, plant and equipment, net	$ 891,198	936,474
Machinery, Equipment and Automotive [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	25 years
Property, plant and equipment, gross	$ 1,213,359	1,204,695
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	26 years
Property, plant and equipment, gross	$ 44,123	38,810
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	34 years
Property, plant and equipment, gross	$ 8,223	8,223
Furniture, Fixtures and Store Equipment [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	5 years
Property, plant and equipment, gross	$ 1,080	1,122
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	18,389	31,575
Capital Spare Parts [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	26,894	24,245
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,567	$ 4,575