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Retirement Plans and Other Postretirement Benefits - Funded Status of Plan and Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Funded status asset (liability):
Fair value of plan assets	$ 913,034	$ 845,979
Projected benefit obligation	(883,940)	(822,297)
Funded status at the end of the year	29,094	23,682
Amounts recognized in the consolidated balance sheet consisted of:
Non-current asset for pension benefits (other assets)	135,628	117,278
Current liabilities for pension benefits	(2,174)	(1,954)
Non-current liability for pension benefits	(104,360)	(91,642)
Net amount recognized at the end of the year	$ 29,094	$ 23,682

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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