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Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - Pension Plans - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 474 | $ 596 | $ 948 | $ 1,192
Interest cost on projected benefit obligation | 5,453 | 4,790 | 10,906 | 9,580
Expected return on plan assets | (6,983) | (7,740) | (13,966) | (15,479)
Net amortization and deferrals | 1,276 | 1,549 | 2,551 | 3,098
Net periodic benefit (income) cost | 220 | (805) | 439 | (1,609)
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 4,873 | 4,470 | 9,746 | 8,939
Interest cost on projected benefit obligation | 4,435 | 4,338 | 8,870 | 8,675
Expected return on plan assets | (10,904) | (12,032) | (21,808) | (24,064)
Net amortization and deferrals | 2,922 | 2,972 | 5,844 | 5,943
Net periodic benefit (income) cost | $ 1,326 | $ (252) | $ 2,652 | $ (507)

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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