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Retirement and Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Defined benefit pension plan contributions	$ 4.1	$ 3.2

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- References

No definition available.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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