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Employee Benefit and Retirement Plans - Summary of Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effective discount rate for benefit obligations | 3.76% | 4.06% | 4.00%
Effective rate for interest on benefit obligations | 3.07% | 3.21% | 4.00%
Effective rate for service cost | 3.25% | 4.16% | 4.00%
Effective rate for interest on service cost | 3.02% | 3.67% | 4.00%
Pension Benefits [Member] | United States Pension Plan of US Entity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effective discount rate for benefit obligations | 3.98% | 4.06% | 4.00%
Effective rate for interest on benefit obligations | 3.28% | 3.21% | 4.00%
Effective rate for service cost | 3.83% | 4.16% | 4.00%
Effective rate for interest on service cost | 3.38% | 3.67% | 4.00%
Long-term rate of return on plan assets | 6.02% | 6.34% | 7.25%
Long-term rate of compensation increase | 2.50% | 2.50% | 2.50%
Pension Benefits [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effective discount rate for benefit obligations | 2.12% | 3.29% | 3.03%
Effective rate for interest on benefit obligations | 1.72% | 2.92% | 3.03%
Effective rate for service cost | 2.44% | 3.39% | 3.03%
Effective rate for interest on service cost | 2.38% | 3.35% | 3.03%
Long-term rate of return on plan assets | 2.61% | 3.93% | 3.86%
Long-term rate of compensation increase | 3.53% | 3.51% | 3.60%

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- Definition Defined Benefit Plan, Weighted Average Assumption in Net Periodic Benefit Cost, Effective Rate for Interest on Service Cost + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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