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Associate Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
During 2019 $ 68
During 2020 69
During 2021 69
During 2022 72
During 2023 76
During 2024 through 2028 463
Total 817
Alliance | Pennsylvania  
Defined Benefit Plan Disclosure [Line Items]  
During 2019 312
During 2020 310
During 2021 432
During 2022 318
During 2023 322
During 2024 through 2028 2,810
Total $ 4,504