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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 2,871 | $ 3,411 | $ 9,383 | $ 10,842
Interest cost | 7,149 | 6,348 | 21,241 | 18,953
Expected return on plan assets | (15,200) | (17,137) | (45,425) | (51,382)
Amortization of prior service cost (credit) | 46 | 34 | 86 | 103
Amortization of actuarial losses (gains) | 4,084 | 1,877 | 12,324 | 5,450
Net periodic benefit (credit) cost | (1,050) | (5,467) | (2,391) | (16,034)
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 16 | 15 | 60 | 78
Interest cost | 200 | 158 | 569 | 483
Amortization of prior service cost (credit) | (586) | 561 | (1,749) | (738)
Amortization of actuarial losses (gains) | (33) | (167) | (366) | (405)
Net periodic benefit (credit) cost | $ (403) | $ 567 | $ (1,486) | $ (582)

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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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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