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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.

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