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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Smith, Gambrell & Russell, LLP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Fees payable to Smith, Gambrell & Russell | $ 0.4 |  | $ 0.2
Amount due to related party |  | $ 0.0 |
European Metal Recycling Limited [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount due to related party | $ 0.3 |  |

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