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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined benefit pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,262 $ 2,186 $ 2,684 $ 4,364
Interest cost 6,159 6,260 12,300 12,532
Expected return on plan assets (6,443) (7,640) (12,916) (15,273)
Amortization of prior service cost (credit) 7 (264) 15 (528)
Recognized actuarial loss (gain) 1,626 4,889 3,462 9,781
Curtailment gain 0 (8,639) 0 (8,639)
Net periodic benefit cost 2,611 (3,208) 5,545 2,237
Postretirement benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 13 21 26 42
Interest cost 286 313 572 626
Recognized actuarial loss (gain) 37 38 74 77
Net periodic benefit cost $ 336 $ 372 $ 672 $ 745