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Associate (Employee) Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
During 2018 $ 68
During 2019 69
During 2020 69
During 2021 70
During 2022 72
During 2023 through 2027 439
Total 787
Alliance | Pennsylvania  
Defined Benefit Plan Disclosure [Line Items]  
During 2018 400
During 2019 317
During 2020 316
During 2021 432
During 2022 324
During 2023 through 2027 2,811
Total $ 4,600