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Currency Conversion - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
US dollar to Pound sterling [Member]
Disclosure Of Foreign Currency Translation [Line Items]
Average exchange rate	1.3763	1.2591	1.2887
Closing exchange rate	1.3194	1.3008	1.3524
Euro to Pound sterling [Member]
Disclosure Of Foreign Currency Translation [Line Items]
Average exchange rate	1.1366	1.1624	1.1413
Closing exchange rate	1.1299	1.1397	1.1250

X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Disclosure Of Foreign Currency Translation [Line Items]

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No definition available.

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