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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution deferral rate	50.00%	75.00%
Total discretionary matching contributions	$ 0.9	$ 1.5
One Year Service
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Employers matching contribution vesting percentage		50.00%
Two Year Service
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Employers matching contribution vesting percentage	100.00%	100.00%
Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution, percent of employees' compensation	6.00%	8.00%

X

- Definition

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

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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- Definition

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