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Pension and Other Post Retirement Benefit Plans - Summary of Pre-tax Amounts in AOCI Expected to Be Recognized in Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses |  | $ 476 | $ 222
German Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses |  | $ 3,398 | $ 2,372
Scenario Forecast | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | $ 7 |  |
Scenario Forecast | German Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial losses | $ 122 |  |

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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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