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Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Tax expense related to benefit plans included in other comprehensive income $ 2,100 $ 4,500 $ 1,200
Defined benefit pension plans      
Net periodic benefit cost:      
Service cost 4,223 4,045 5,557
Interest cost 18,117 17,961 24,526
Expected return on plan assets (22,508) (23,072) (25,726)
Amortization of prior service cost (credit) 29 29 461
Recognized actuarial loss (gain) 8,518 8,362 6,994
Settlement loss 3,248 0 1,772
Curtailment loss 739 103 415
Net periodic benefit cost 12,366 7,428 13,999
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net actuarial (gain) loss (4,433) 46 (1,531)
Prior service cost (credit) 114 0 505
Amortization of prior service (cost) credit (29) (29) (461)
Total recognized in other comprehensive (loss) income (4,348) 17 (1,487)
Total recognized in net periodic benefit cost (credit) and other comprehensive (loss) income 8,018 7,445 12,512
Postretirement benefit plans      
Net periodic benefit cost:      
Service cost 1 2 52
Interest cost 208 812 1,143
Expected return on plan assets 0 0 0
Amortization of prior service cost (credit) (2,037) 0 0
Recognized actuarial loss (gain) (320) 149 148
Settlement loss 0 0 0
Curtailment loss 0 0 0
Net periodic benefit cost (2,148) 963 1,343
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net actuarial (gain) loss (276) (2,746) (1,833)
Prior service cost (credit) 0 (16,261) 0
Amortization of prior service (cost) credit 2,037 0 0
Total recognized in other comprehensive (loss) income 1,761 (19,007) (1,833)
Total recognized in net periodic benefit cost (credit) and other comprehensive (loss) income $ (387) $ (18,044) $ (490)