Inventories (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Inventory Disclosure [Abstract]
Aluminum and steel coil	$ 59,651	$ 52,681
Raw materials	14,520	12,808
Work in process	1,598	2,980
Finished products	13,525	14,927
Inventories, net	89,294	83,396
Summary of Obsolete Inventory Reserve [Roll Forward]
Balance, beginning of year	3,009	2,405	4,130
Net charges to costs and expenses	4,386	3,626	2,601
Write-offs	(4,534)	(2,998)	(4,232)
Foreign currency translation	50	(24)	(94)
Balance, end of year	$ 2,911	$ 3,009	$ 2,405