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Discontinued Operation - Additional Information (Detail) $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 02, 2017 USD ($) | Oct. 02, 2017 AUD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 AUD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2018 AUD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [line items] |  |  |  |  |  |  |
Profit on the sale assets |  |  | $ 0.0 |  | $ 0.0 | $ (2.3) |
Darlot [Member] |  |  |  |  |  |  |
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [line items] |  |  |  |  |  |  |
Consideration from disposal |  |  |  | $ 18.5 |  |  |
Cash consideration from disposal |  |  |  | $ 12.0 |  |  |
Number of shares received from disposal | shares |  |  | 130,000,000 | 130,000,000 |  |  |
Upfront cash consideration received |  |  | $ 0.0 | $ 7.0 | $ 5.4 | $ 0.0 |
Cash consideration receivable |  |  |  | $ 5.0 |  |  | $ 5.0
Profit on the sale assets | $ 23.5 | $ 30.8 |  |  |  |  |
Percentage of shares held | 19.90% | 19.90% |  |  |  |  |
Darlot [Member] | Red 5 Limited [Member] |  |  |  |  |  |  |
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [line items] |  |  |  |  |  |  |
Shares received under underwriting agreement related to disposal of discontinued operation | shares |  |  |  | 116,875,821 |  |  |
Consideration received under underwriting agreement related to disposal of discontinued operation |  |  |  | $ 5.8 |  |  |

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