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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 3,254 | $ 3,710 | $ 6,512 | $ 7,431
Interest cost | 7,043 | 6,296 | 14,092 | 12,605
Expected return on plan assets | (15,112) | (17,122) | (30,225) | (34,245)
Amortization of prior service cost (credit) | 21 | 34 | 40 | 69
Amortization of actuarial losses (gains) | 4,121 | 1,787 | 8,240 | 3,573
Net periodic benefit credit | (673) | (5,295) | (1,341) | (10,567)
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 22 | 32 | 44 | 63
Interest cost | 184 | 162 | 369 | 325
Amortization of prior service cost (credit) | (581) | (650) | (1,163) | (1,299)
Amortization of actuarial losses (gains) | (166) | (119) | (333) | (238)
Net periodic benefit credit | $ (541) | $ (575) | $ (1,083) | $ (1,149)

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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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