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Fair Value Measurements - Reconciliation of Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | $ 741,191 | $ 714,017
Actual return on plan assets: |  |
End of measurement period | 739,789 | 741,191
U.S. |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 404,275 |
Actual return on plan assets: |  |
End of measurement period | 389,689 | 404,275
U.K Plan |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 303,954 |
Actual return on plan assets: |  |
End of measurement period | 312,119 | 303,954
Significant Unobservable Inputs (Level 3) | U.S. |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 15,938 | 14,766
Actual return on plan assets: |  |
Related to assets still held at the reporting date | (3,575) | 1,172
Purchases, sales and settlements, net | 6,099 |
End of measurement period | 13,414 | 15,938
Significant Unobservable Inputs (Level 3) | U.K Plan |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 9,572 | 9,735
Actual return on plan assets: |  |
Related to assets still held at the reporting date | 1,683 | (163)
Purchases, sales and settlements, net | 0 |
End of measurement period | $ 11,255 | $ 9,572

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