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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Defined Benefit Plan Disclosure |  |  |  |
Net actuarial (gain) loss |  |  | $ 448 | $ (71)
UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | $ 399 | $ 545 | 804 | 1,116
Interest cost | 1,799 | 2,430 | 3,595 | 5,427
Expected return on plan assets | (1,510) | (2,550) | (3,021) | (5,919)
Amortization of prior service cost |  | 14 |  | 29
Net actuarial (gain) loss | 252 | (189) | 252 | (189)
Settlement loss |  | 78 |  | 78
Total net periodic pension cost | 940 | 328 | 1,630 | 542
Foreign Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 192 | 200 | 381 | 426
Interest cost | 176 | 175 | 349 | 372
Expected return on plan assets | (7) | (5) | (14) | (10)
Total net periodic pension cost | 361 | 370 | 716 | 788
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 11 | 10 | 20 | 19
Interest cost | 88 | 48 | 173 | 98
Amortization of prior service cost | (48) | (93) | (95) | (187)
Net actuarial (gain) loss | 196 | 40 | 196 | 40
Special termination benefits |  | 1,192 |  | 2,818
Total net periodic pension cost | $ 247 | $ 1,197 | $ 294 | $ 2,788

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