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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Components of Net Periodic Pension Cost        
Service cost—benefits earned during the period $ 672 $ 631 $ 1,344 $ 1,262
Interest cost on projected benefit obligation 1,100 1,106 2,200 2,212
Expected return on plan assets (1,807) (1,735) (3,614) (3,470)
Amortization of prior service (credit) cost (35) (35) (70) (70)
Recognized net actuarial loss 468 209 936 418
Net Periodic Pension Expense $ 398 $ 176 $ 796 $ 352