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Postretirement Benefit Plans - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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United States [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Non-current asset | $ 7,166 | $ 3,470
Current liability | (290) | (288)
Non-current liability | (3,165) | (15,217)
Net amount recognized | 3,711 | (12,035)
United Kingdom [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Non-current asset | 4,188 | 2,978
Net amount recognized | $ 4,188 | $ 2,978

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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 + Details
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