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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Smith, Gambrell & Russell, LLP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Fees payable to Smith, Gambrell & Russell | $ 0.1 | $ 0.2 |
Amount due to related party | 0.0 |  | $ 0.1
European Metal Recycling Limited [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount due to related party | 0.1 |  | 0.0
Tendering process to select best buyer of scrap metal | 0.4 | 0.0 |
Advan Six [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount due to related party | 0.1 |  | $ 0.0
Tendering process to select best buyer of scrap metal | $ 0.1 | $ 0.2 |

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