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Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) income: |  |  |
Tax expense related to benefit plans included in other comprehensive income | $ 5,500 | $ 2,100 | $ 4,500
Defined benefit pension plans |  |  |
Net periodic benefit cost (credit): |  |  |
Service cost | 4,479 | 4,223 | 4,045
Interest cost | 19,309 | 18,117 | 17,961
Expected return on plan assets | (21,714) | (22,508) | (23,072)
Amortization of prior service cost (credit) | 64 | 29 | 29
Recognized actuarial loss (gain) | 7,585 | 8,518 | 8,362
Settlement loss | 0 | 3,248 | 0
Curtailment loss | 92 | 739 | 103
Net periodic benefit cost | 9,815 | 12,366 | 7,428
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) income: |  |  |
Net actuarial loss (gain) | 28,740 | (4,433) | 46
Prior service cost (credit) | 26 | 114 | 0
Amortization of prior service (cost) credit | (64) | (29) | (29)
Total recognized in other comprehensive (loss) income | 28,702 | (4,348) | 17
Total recognized in net periodic benefit cost (credit) and other comprehensive (loss) income | 38,517 | 8,018 | 7,445
Postretirement benefit plans |  |  |
Net periodic benefit cost (credit): |  |  |
Service cost | 1 | 1 | 2
Interest cost | 201 | 208 | 812
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service cost (credit) | (2,038) | (2,037) | 0
Recognized actuarial loss (gain) | (384) | (320) | 149
Settlement loss | 0 | 0 | 0
Curtailment loss | 0 | 0 | 0
Net periodic benefit cost | (2,220) | (2,148) | 963
Other changes in plan assets and benefit obligations recognized in other comprehensive (loss) income: |  |  |
Net actuarial loss (gain) | 1,870 | (276) | (2,746)
Prior service cost (credit) | 0 | 0 | (16,261)
Amortization of prior service (cost) credit | 2,038 | 2,037 | 0
Total recognized in other comprehensive (loss) income | 3,908 | 1,761 | (19,007)
Total recognized in net periodic benefit cost (credit) and other comprehensive (loss) income | $ 1,688 | $ (387) | $ (18,044)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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