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Employee Benefit Plans - Projected Annual Benefit Payment (Detail) - Supplemental Executive Retirement Plan
$ in Thousands
Dec. 31, 2015
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2016 $ 0
2017 0
2018 0
2019 10,297
2020 0
2021-2025 0
Thereafter $ 3,987