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Discontinued Operations and Disposition - Summary of Major Classes of ASW's Loss from Discontinued Operations, Net of Tax in the Condensed Consolidated Statements of Operations (Detail) - ASW Steel Inc [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Net sales $ 15,045 $ 22,334
Costs of products sold (excluding depreciation and amortization) 16,758 20,776
Selling and administrative 549 617
Depreciation and amortization 0 305
Gain on disposal of assets 0 (38)
(Loss) income from discontinued operations (2,262) 674
Other income (expense) 20 (721)
Loss from discontinued operations before income taxes (2,242) (47)
Income tax provision 0 (22)
Loss from discontinued operations, net of tax $ (2,242) $ (69)