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Currency Conversion - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
US dollar to Pound sterling [member] |  |  |
Disclosure Of Foreign Currency Translation [line items] |  |  |
Average exchange rate | 1.2938 | 1.3763 | 1.3351
Closing exchange rate | 1.2695 | 1.3194 | 1.2746
Euro to Pound sterling [member] |  |  |
Disclosure Of Foreign Currency Translation [line items] |  |  |
Average exchange rate | 1.1453 | 1.1366 | 1.1303
Closing exchange rate | 1.1175 | 1.1299 | 1.1130

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- Details
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