Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 05, 2014
Goodwill [Line Items]
Balance, beginning of period	$ 1,973,608
Translation	(2,156)
Balance, end of period	1,971,452
Steel Mills [Member]
Goodwill [Line Items]
Balance, beginning of period	495,897
Translation
Balance, end of period	495,897
Steel Products [Member]
Goodwill [Line Items]
Balance, beginning of period	774,486
Translation	(2,156)
Balance, end of period	772,330
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	703,225
Translation
Balance, end of period	$ 703,225