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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Other Postretirement Benefit Plan | UNITED STATES |  |  |  |
Net periodic benefit cost |  |  |  |
Service cost | $ 1 | $ 1 | $ 2 | $ 2
Interest cost | 81 | 88 | 162 | 176
Net amortization/deferrals | (76) | (73) | (152) | (146)
Net periodic benefit cost (credit) | 6 | 16 | $ 12 | $ 32
Assumptions |  |  |  |
Discount Rate |  |  | 3.43% | 3.76%
Other Postretirement Benefit Plan | Foreign Plan |  |  |  |
Net periodic benefit cost |  |  |  |
Service cost | 8 | 7 | $ 16 | $ 14
Interest cost | 26 | 24 | 52 | 48
Net amortization/deferrals | (4) | (7) | (8) | (14)
Net periodic benefit cost (credit) | 30 | 24 | $ 60 | $ 48
Assumptions |  |  |  |
Discount Rate |  |  | 3.21% | 3.46%
Pension Plan | UNITED STATES |  |  |  |
Net periodic benefit cost |  |  |  |
Service cost | 87 | 86 | $ 174 | $ 172
Interest cost | 333 | 356 | 666 | 712
Expected return on plan assets | (445) | (433) | (890) | (866)
Net amortization/deferrals | 243 | 248 | 486 | 496
Net periodic benefit cost (credit) | 218 | 257 | $ 436 | $ 514
Assumptions |  |  |  |
Discount Rate |  |  | 3.56% | 3.95%
Expected long-term rate of return |  |  | 5.15% | 4.95%
Rate of compensation increase |  |  | 3.00% | 3.00%
Pension Plan | Foreign Plan |  |  |  |
Net periodic benefit cost |  |  |  |
Service cost | 691 | 614 | $ 1,382 | $ 1,228
Interest cost | 1,834 | 1,677 | 3,668 | 3,354
Expected return on plan assets | (3,466) | (2,910) | (6,932) | (5,820)
Net amortization/deferrals | 554 | 685 | 1,108 | 1,370
Net periodic benefit cost (credit) | $ (387) | $ 66 | $ (774) | $ 132
Assumptions |  |  |  |
Discount Rate |  |  | 2.40% | 2.51%
Expected long-term rate of return |  |  | 5.10% | 4.93%
Rate of compensation increase |  |  | 2.60% | 2.54%

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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 (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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