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Pension Plans - Amount Recognized in Accumulated Other Comprehensive Loss Related to Pension Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation Income Net Of Tax [Abstract]
Beginning Balance	$ (5,671)	$ (5,873)
Pre-tax amortized net actuarial loss	475	520
Tax provision	(112)	(123)
Net of reclassification adjustments	363	397	$ 386
Pre-tax loss	(1,829)	(255)
Tax provision	433	60
Net of tax adjustment to recognize (loss) gain on unfunded pension obligations	(1,396)	(195)	(244)
Ending Balance	$ (6,704)	$ (5,671)	$ (5,873)

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- Definition

Compensation income net of tax.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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