Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail)	12 Months Ended
	Dec. 31, 2020
Machinery, equipment, vehicles and office furniture [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	2 years
Machinery, equipment, vehicles and office furniture [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	12 years
Building and building improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	15 years
Building and building improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	30 years
Computer equipment and software [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	3 years
Computer equipment and software [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets (in years)	10 years