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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Smith, Gambrell & Russell, LLP [Member]
Related Party Transaction [Line Items]
Fees payable to Smith, Gambrell & Russell	$ 0.5	$ 0.3	$ 0.4
Amount due to related party	0.0	0.0
European Metal Recycling Limited [Member]
Related Party Transaction [Line Items]
Amount due to related party	0.0	0.1
Sale of scrap metal	$ 0.4	$ 0.3	$ 0.0

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