Guarantees - Changes in Accrued Warranty (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014		Mar. 30, 2013
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 5,252	[1]	$ 4,692
Warranty expense accruals	1,211		240
Warranty payments	(1,549)		(1,409)
Warranty liability assumed from Ismeca acquisition			1,817
Balance at end of period	$ 4,914		$ 5,340

[1] Derived from December 28, 2013 audited financial statements