Property, Plant and Equipment - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
Chemical Processing Plants and Plant Infrastructure [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	15 years
Chemical Processing Plants and Plant Infrastructure [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	30 years
Processing Plant Components [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Processing Plant Components [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Trucks, Automobiles, Trailers, and Other Rolling Stock [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	2 years
Trucks, Automobiles, Trailers, and Other Rolling Stock [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	7 years