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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	May 31, 2018
Smith, Gambrell & Russell, LLP [Member]
Related Party Transaction [Line Items]
Fees payable to Smith, Gambrell & Russell	$ 0.2		$ 0.1
Amount due to related party	0.0	$ 0.0
European Metal Recycling Limited [Member]
Related Party Transaction [Line Items]
Amount due to related party	$ 0.3

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