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Other Post-Employment Benefits and Other Employee Benefit Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Other Post-Employment Benefits and Other Employee Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Minimum age of employee for entitlement of other post retirement benefit plans | 55 years |
Minimum number of years of service for entitlement of other post retirement benefit plans | 10 years |
Amortization period of transition obligation | 20 years |
Accumulated post-retirement benefit obligations, weighted-average discount rate | 3.90% | 4.00%
Belgian Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for the year | 4.00% |
U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for the year | 7.00% |
Health care cost trend rate downgraded | 5.00% |
Year in which rate reaches ultimate trend rate | 2022 |
Canada Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for the year | 5.50% |
Health care cost trend rate downgraded | 5.00% |
Year in which rate reaches ultimate trend rate | 2018 |

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- Definition Minimum age of employee for entitlement of other postretirement benefit plans. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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=65897934&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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