Derivative Financial Instruments - Summary of Non-designated Hedges (Detail) - Derivatives not designated as hedging instruments £ in Thousands, kr in Thousands, $ in Thousands	Mar. 31, 2024 GBP (£) derivative_instrument	Dec. 31, 2023 SEK (kr) derivative_instrument	Dec. 31, 2023 GBP (£) derivative_instrument	Dec. 31, 2023 AUD ($) derivative_instrument
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	4	2	2	2
Notional Amount | £	£ 48,700		£ 26,900
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments	4	2	2	2
Notional Amount | £	£ 48,700		£ 26,900
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments		1	1	1
Notional Amount | kr		kr 30,800
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments		1	1	1
Notional Amount | kr		kr 30,800
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments		1	1	1
Notional Amount | $				$ 7,600
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Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of Instruments		1	1	1
Notional Amount | $				$ 7,600