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U.K. Sale - Summary of Funded Status (Unfunded Liability) (Detail) - Discontinued Operations [Member] - U.K. Sales [Member] - Pension Plan [Member] - Partnership in Care Benefits Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Projected benefit obligation	$ 80,158	$ 66,468
Fair value of plan assets	71,979	62,207
Unfunded liability	$ 8,179	$ 4,261

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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