Share-Based Payments - Summary of Shares Granted under Restricted Share Arrangements (Detail) - Restricted shares [member] pure in Thousands	12 Months Ended
Dec. 31, 2018 GBP (£)	Dec. 31, 2017 GBP (£)
Long-term incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	2,907	6,453
Weighted average fair value	£ 7.55	£ 6.61
Management incentive plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares	2,035
Weighted average fair value	£ 7.45

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

+ Details

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard
-URIDate 2018-03-16

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- Definition

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

+ References

+ Details

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- Details

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- Details

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