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Employee Benefit Plans - Information Concerning Defined Benefit Pension Plans (Including Certain Plans for Which ABO Exceeds Fair Value of Plan Assets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	$ 52,873	$ 50,350	$ 49,249
Fair value of plan assets	50,260	46,313	$ 40,626
U.S.
Defined Benefit Plan Disclosure [Line Items]
PBO for plans for which ABO exceeds plan assets	43,754	42,198
ABO for plans for which ABO exceeds plan assets	43,754	42,198
Fair value of plan assets for plans for which ABO exceeds plan assets	37,260	33,867
U.S. | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	43,754	42,198
Fair value of plan assets	37,260	33,867
U.K. | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
PBO	9,119	8,152
Fair value of plan assets	$ 13,000	$ 12,446

X

- Definition

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

+ References

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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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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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