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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 2 years 6 months    
Operating lease, weighted average remaining lease term 18 years 2 months 12 days    
Operating lease, weighted average discount rate, percent 5.02%    
Finance lease, weighted average discount rate, percent 4.54%    
Rental expense for leases   $ 2.6 $ 2.6
Total minimum sublease rentals under noncancelable subleases $ 3.6    
Future minimum lease payments, 2019   2.2  
Future minimum lease payments, 2020   1.8  
Future minimum lease payments, 2021   1.6  
Future minimum lease payments, 2022   0.9  
Future minimum lease payments, 2023   0.2  
Future minimum lease payments, Thereafter   $ 6.3  
Maximum [Member]      
Leases [Line Items]      
Leases, term of contract 99 years