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Pension Plans - Fair Value of the Company's Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Assets measured at net asset value	$ 36,756	$ 32,658
Pooled Investment Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets measured at net asset value	$ 36,756	$ 32,658

X

- Definition

Defined benefit plan assets net asset value.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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