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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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