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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 |

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