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Employee Benefit Plans - Expected Cash Flows for Pension Plans (Detail) - Pension Benefits [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Employer contribution 2017 (expected) $ 48,000
Expected benefit payments:  
2017 109,000
2018 116,000
2019 122,000
2020 127,000
2021 133,000
2022 through 2026 $ 721,000