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Associate Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
During 2020 $ 63
During 2021 62
During 2022 64
During 2023 67
During 2024 72
During 2025 through 2029 447
Total 775
Alliance | Pennsylvania  
Defined Benefit Plan Disclosure [Line Items]  
During 2020 6,900
Beneficial | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
During 2020 4,744
During 2021 5,649
During 2022 4,874
During 2023 5,501
During 2024 6,219
During 2025 through 2029 27,855
Total 54,842
Beneficial | Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
During 2020 990
During 2021 1,007
During 2022 1,022
During 2023 1,033
During 2024 1,052
During 2025 through 2029 5,780
Total $ 10,884