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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 400 | $ 474 | $ 800 | $ 948
Interest cost on projected benefit obligation | 4,263 | 5,453 | 8,526 | 10,906
Expected return on plan assets | (7,083) | (6,983) | (14,166) | (13,966)
Net amortization and deferrals | 1,858 | 1,276 | 3,716 | 2,551
Net periodic benefit (income) cost | (562) | 220 | (1,124) | 439
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 5,940 | 4,873 | 11,880 | 9,746
Interest cost on projected benefit obligation | 3,246 | 4,435 | 6,491 | 8,870
Expected return on plan assets | (11,614) | (10,904) | (23,228) | (21,808)
Net amortization and deferrals | 3,834 | 2,922 | 7,668 | 5,844
Net periodic benefit (income) cost | $ 1,406 | $ 1,326 | $ 2,811 | $ 2,652

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