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Employee Benefit Plans (Pension Benefit Plan) - Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Net actuarial loss	$ (11,256)	$ (5,812)

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- Definition

Defined benefit plan accumulated other comprehensive income net actuarial gains losses net of tax.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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