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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

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- Details
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