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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Smith, Gambrell & Russell, LLP [Member]
Related Party Transaction [Line Items]
Fees payable to Smith, Gambrell & Russell	$ 0.8	$ 0.5	$ 0.3
Amount due to related party	0.0	0.1
European Metal Recycling Limited [Member]
Related Party Transaction [Line Items]
Amount due to related party	0.0	0.0
Tendering process to select best buyer of scrap metal	0.2	$ 0.4	$ 0.3
Advan Six [Member]
Related Party Transaction [Line Items]
Amount due to related party	0.0
Tendering process to select best buyer of scrap metal	$ 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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