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Leases - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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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 |  |

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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