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Fair Value Measurements - Pension Plan Assets within Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | $ 477,728 | $ 739,789 | $ 741,191
U.K Plan |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 174,873 | 312,126 |
U.K Plan | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 2,411 | 33,518 |
U.K Plan | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 34,485 | 64,704 |
U.K Plan | US Government Agencies Debt Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 91,256 | 141,870 |
U.K Plan | Alternative strategies |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 37,246 | 60,779 |
U.K Plan | Real Estate Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 9,475 | 11,255 |
U.K Plan | Quoted Prices in Active Markets (Level 1) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 4,856 | 37,414 |
U.K Plan | Quoted Prices in Active Markets (Level 1) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 2,411 | 33,518 |
U.K Plan | Quoted Prices in Active Markets (Level 1) | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Quoted Prices in Active Markets (Level 1) | US Government Agencies Debt Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Quoted Prices in Active Markets (Level 1) | Alternative strategies |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 2,445 | 3,896 |
U.K Plan | Quoted Prices in Active Markets (Level 1) | Real Estate Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 160,542 | 263,457 |
U.K Plan | Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Other Observable Inputs (Level 2) | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 34,485 | 64,704 |
U.K Plan | Significant Other Observable Inputs (Level 2) | US Government Agencies Debt Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 91,256 | 141,870 |
U.K Plan | Significant Other Observable Inputs (Level 2) | Alternative strategies |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 34,801 | 56,883 |
U.K Plan | Significant Other Observable Inputs (Level 2) | Real Estate Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 9,475 | 11,255 | 9,572
U.K Plan | Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Unobservable Inputs (Level 3) | Money Market Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Unobservable Inputs (Level 3) | US Government Agencies Debt Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Unobservable Inputs (Level 3) | Alternative strategies |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
U.K Plan | Significant Unobservable Inputs (Level 3) | Real Estate Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 9,475 | 11,255 |
US |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 281,159 | 389,689 |
Other plan liabilities, net | [1] | (1,409) | (1,522) |
Net plan assets |  | 279,750 | 388,167 |
US | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 4,847 | 20,706 |
US | Short-term Investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 11,212 | 25,569 |
US | United States Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 24,235 | 40,191 |
US | International Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 12,844 | 25,879 |
US | United States Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 185,641 | 225,846 |
US | International Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 20,913 | 29,300 |
US | Asset Categories Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 21,467 | 22,197 |
US | Quoted Prices in Active Markets (Level 1) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 63,417 | 60,010 |
US | Quoted Prices in Active Markets (Level 1) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 4,847 | 20,706 |
US | Quoted Prices in Active Markets (Level 1) | Short-term Investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Quoted Prices in Active Markets (Level 1) | United States Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Quoted Prices in Active Markets (Level 1) | International Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Quoted Prices in Active Markets (Level 1) | United States Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 58,570 | 39,304 |
US | Quoted Prices in Active Markets (Level 1) | International Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Quoted Prices in Active Markets (Level 1) | Asset Categories Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 199,549 | 310,411 |
US | Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Other Observable Inputs (Level 2) | Short-term Investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 11,212 | 25,569 |
US | Significant Other Observable Inputs (Level 2) | United States Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 24,235 | 40,191 |
US | Significant Other Observable Inputs (Level 2) | International Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 12,844 | 25,879 |
US | Significant Other Observable Inputs (Level 2) | United States Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 127,071 | 186,542 |
US | Significant Other Observable Inputs (Level 2) | International Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 20,913 | 29,300 |
US | Significant Other Observable Inputs (Level 2) | Asset Categories Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 3,274 | 2,929 |
US | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 18,194 | 19,268 | $ 21,861
US | Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | Short-term Investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | United States Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | International Equity Securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | United States Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | International Fixed Income Funds |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | 0 | 0 |
US | Significant Unobservable Inputs (Level 3) | Asset Categories Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Total plan assets |  | $ 18,194 | $ 19,268 |
[1] | net amounts payable for unsettled security transactions.

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