Industry Segments (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Industry Segments [Abstract]
Decrease in accruals related to import duties included in cost of goods sold	$ 3,100,000
Summary of segment information [Abstract]
Net sales	574,374,000	559,690,000
Cost of goods sold	495,777,000	482,850,000
Depreciation and amortization	8,107,000	8,154,000
Selling, general, and administrative expense	32,183,000	31,343,000
Operating income	38,307,000	37,343,000
Interest expense	(1,026,000)	(596,000)
Other income, net	88,000	3,163,000
Income before income taxes	37,369,000	39,910,000
Plumbing and Refrigeration Segment [Member]
Summary of segment information [Abstract]
Net sales	338,027,000	311,814,000
Cost of goods sold	289,025,000	264,814,000
Depreciation and amortization	4,420,000	4,247,000
Selling, general, and administrative expense	20,697,000	20,128,000
Operating income	23,885,000	22,625,000
OEM Segment [Member]
Summary of segment information [Abstract]
Net sales	240,030,000	253,787,000
Cost of goods sold	210,403,000	223,880,000
Depreciation and amortization	3,083,000	3,362,000
Selling, general, and administrative expense	5,258,000	6,222,000
Operating income	21,286,000	20,323,000
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(3,683,000)	(5,911,000)
Cost of goods sold	(3,651,000)	(5,844,000)
Depreciation and amortization	604,000	545,000
Selling, general, and administrative expense	6,228,000	4,993,000
Operating income	$ (6,864,000)	$ (5,605,000)