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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Losses related to foreign currency/equity method investment/operations	$ (296,773)	$ (304,646)	$ (257,513)
Canadian Operations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Losses related to foreign currency/equity method investment/operations	(114,800)
Duferdofin Nucor S.r.l. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Losses related to foreign currency/equity method investment/operations	$ (182,000)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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