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Employee Benefit Plans - Estimated Future Benefit Payments for Defined Benefit Pension and Postretirement Benefit Plans (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Defined benefit pension plans  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 37,588
2017 39,477
2018 38,114
2019 35,783
2020 36,547
2020 - 2024 182,695
Postretirement benefit plans  
Defined Benefit Plan Disclosure [Line Items]  
2016 3,300
2017 3,100
2018 3,100
2019 3,100
2020 2,900
2020 - 2024 $ 13,400