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Trade and Other Payables - Additional Information (Detail) - GBP (£) | Dec. 31, 2019 | Dec. 31, 2018
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Bottom of range [member] | Earnout agreements for acquisitions completed in the current year [member] |  |
Disclosure of trade and other payables [line items] |  |
Potential undiscounted amount of future payments | £ 0 | £ 0
Bottom of range [member] | All earn-out agreements [member] |  |
Disclosure of trade and other payables [line items] |  |
Potential undiscounted amount of future payments | 0 | 0
Top of range [member] | Earnout agreements for acquisitions completed in the current year [member] |  |
Disclosure of trade and other payables [line items] |  |
Potential undiscounted amount of future payments | 14,000,000 | 179,000,000
Top of range [member] | All earn-out agreements [member] |  |
Disclosure of trade and other payables [line items] |  |
Potential undiscounted amount of future payments | £ 1,110,000,000 | £ 1,960,000,000

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