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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Line Items]    
Leases, term of description the leases in effect were related to land, buildings, vehicles, office equipment and other production equipment under operating leases with lease terms of up to 99 years.  
Finance lease, weighted average remaining lease term 3 years 7 months 6 days  
Operating lease, weighted average remaining lease term 17 years 8 months 12 days  
Operating lease, weighted average discount rate, percent 4.46% 4.46%
Finance lease, weighted average discount rate, percent 4.33% 4.33%
Total minimum sublease rentals under noncancelable subleases $ 2.6  
Maximum [Member]    
Leases [Line Items]    
Leases, term of contract 99 years