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Employee Benefits Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Components of Net Periodic Pension Cost        
Service cost—benefits earned during the period $ 0 $ 672 $ 474 $ 1,344
Interest cost on projected benefit obligation 1,036 1,100 2,101 2,200
Expected return on plan assets (1,434) (1,807) (2,893) (3,614)
Amortization of prior service credit (35) (35) (70) (70)
Recognized net actuarial loss 526 468 1,070 936
Net Periodic Pension Expense $ 93 $ 398 $ 682 $ 796