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Associate Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
During 2021 $ 55
During 2022 57
During 2023 60
During 2024 65
During 2025 71
During 2026 through 2030 425
Total 733
Beneficial | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
During 2021 4,694
During 2022 4,918
During 2023 5,488
During 2024 6,123
During 2025 5,078
During 2026 through 2030 28,445
Total 54,746
Beneficial | Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
During 2021 1,099
During 2022 1,103
During 2023 1,129
During 2024 1,120
During 2025 1,145
During 2026 through 2030 5,516
Total $ 11,112