Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Apr. 02, 2016 USD ($) Manufacturers_Distributors Complaints Defendant	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, gross	$ 20.7	$ 21.1
Accrued environmental loss contingencies, current	9.4	9.7
Accrued environmental loss contingencies, noncurrent	$ 11.3	$ 11.4
Northern District of Illinois [Member]
Loss Contingencies [Line Items]
Steel manufacturers, number of manufacturers | Manufacturers_Distributors	8
Additional complaints being filed in July and December of 2010 | Complaints	2
Complaints that are dismissed | Complaints	2
Defendants that have reached court approved settlements with the plaintiffs | Defendant	5