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Postretirement Benefit Plans - Schedule of Amounts Recognized in Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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United States [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Current liability | $ (302) | $ (302)
Non-current liability | (24,094) | (23,148)
Net amount recognized | (24,396) | (23,450)
United Kingdom [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Non-current asset | 570 | 120
Net amount recognized | $ 570 | $ 120

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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=108410482&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=109237824&loc=d3e1703-114919 + Details
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