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Items to be Recognized in 2018 as Component of Net Periodic Cost (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligations in excess of plan assets, projected benefit obligation | $ 101,200 | $ 71,000
Pension Benefits [Member] |  |
Items to be recognized in 2018 as a component of net periodic cost |  |
Net actuarial loss (gain) | 7,169 |
Prior service cost (credit) | 173 |
Net periodic cost (credit) to be recorded in 2018 | 7,342 |
Other Postretirement Benefits [Member] |  |
Items to be recognized in 2018 as a component of net periodic cost |  |
Net actuarial loss (gain) | (474) |
Prior service cost (credit) | (2,602) |
Net periodic cost (credit) to be recorded in 2018 | $ (3,076) |

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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