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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of net periodic pension cost:
Labor and Related Expense	$ 7,831	$ 8,056	$ 22,735	$ 23,688
Pension Benefits
Components of net periodic pension cost:
Labor and Related Expense	308	327	968	1,081
Interest cost	164	128	381	447
Expected return on plan assets	(371)	(217)	(865)	(759)
Amortization of unrecognized net gain	65	45	152	159
Net periodic benefit	$ (142)	$ (44)	$ (332)	$ (153)

X

- Definition

The net periodic benefit cost associated with the amortization of unrecognized gain (loss) for defined benefit plans for the period.

+ References

No definition available.

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X

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. In addition, includes settlements for departed employees.

+ References

No definition available.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

+ References

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