XML 96 R74.htm IDEA: XBRL DOCUMENT v3.21.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
Land improvements [member]  
Disclosure of significant accounting policies [line items]  
Useful lives of property, plant and equipment 20 years
Buildings (assets used by the Company and assets subject to operating leases) [member] | Bottom of range [member]  
Disclosure of significant accounting policies [line items]  
Useful lives of property, plant and equipment 10 years
Buildings (assets used by the Company and assets subject to operating leases) [member] | Top of range [member]  
Disclosure of significant accounting policies [line items]  
Useful lives of property, plant and equipment 20 years
Machinery and equipment [member]  
Disclosure of significant accounting policies [line items]  
Useful lives of property, plant and equipment 5 years
Office equipment [member]  
Disclosure of significant accounting policies [line items]  
Useful lives of property, plant and equipment 5 years