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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 01, 2019	Sep. 30, 2020	Aug. 31, 2020	Aug. 31, 2019	Nov. 30, 2020	May 31, 2020	Dec. 31, 2019	Dec. 19, 2019
Investments in and Advances to Affiliates [Line Items]
Impairment charge			$ 9,924,000
Distributions from unconsolidated affiliates					$ 47,116,000
Distributions in excess of investment in unconsolidated affiliate					$ 107,951,000	$ 103,837,000
Proceeds from Sale of Equity Method Investments		$ 2,950,000
Samuel Joint Venture \| Joint Venture Transactions
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates					63.00%
Additional ownership interest acquired in joint venture							31.75%
ArtiFlex
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates					50.00%
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates					25.00%
Cabs Joint Venture
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	20.00%				20.00%
Impairment charge				$ 35,194,000
Net gain on deconsolidation	$ 258,000
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates					50.00%
WAVE
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates					50.00%
Distributions in excess of investment in unconsolidated affiliate					$ 107,951,000
Nisshin
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates								10.00%
Impairment charge				$ 4,236,000