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Postretirement Benefit Plans - Defined Benefit Pension Plans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Defined Contribution Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Balance of trust assets | $ 1,617,000 | $ 1,617,000
United States [Member] | Funded Plan [Member] | Qualified Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 5,000,000 | 5,000,000
Expected contribution to defined benefit plans | 0 | 0
United States [Member] | Unfunded Plan [Member] | Non-qualified Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions |  | 256,000
Expected contribution to defined benefit plans | 312,000 | 312,000
U.K Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions |  | 372,000
Expected contribution to defined benefit plans | $ 497,000 | $ 497,000

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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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