Environmental Settlement and Related Costs - Additional Information (Detail)			3 Months Ended	9 Months Ended
	Oct. 01, 2014 USD ($) Charge	Aug. 25, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)
Environmental Remediation Obligations [Abstract]
Fines associated with the Consent Decree amount		$ 3,000,000	$ 6,600,000	$ 6,600,000
Preliminarily estimated cost of restoration		3,000,000
Maximum cost of restoration		$ 9,000,000
Fine agreed to pay for violation of the Clean Water Act	$ 600,000
Period of probation	2 years
Number of misdemeanor charges to which the company pleaded guilty | Charge	3