Industry Segments (Details) (USD $)	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
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	537,242,000	574,374,000
Cost of goods sold	460,834,000	495,777,000
Depreciation and amortization	7,853,000	8,107,000
Selling, general, and administrative expense	32,831,000	32,183,000
Operating income	35,724,000	38,307,000
Interest expense	(2,076,000)	(1,026,000)
Other income, net	105,000	88,000
Income before income taxes	33,753,000	37,369,000
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(3,092,000)	(3,683,000)
Cost of goods sold	(3,062,000)	(3,651,000)
Depreciation and amortization	475,000	604,000
Selling, general, and administrative expense	5,810,000	6,228,000
Operating income	(6,315,000)	(6,864,000)
Plumbing and Refrigeration Segment [Member] | Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	305,017,000	338,027,000
Cost of goods sold	260,463,000	289,025,000
Depreciation and amortization	4,523,000	4,420,000
Selling, general, and administrative expense	20,540,000	20,697,000
Operating income	19,491,000	23,885,000
OEM Segment [Member] | Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	235,317,000	240,030,000
Cost of goods sold	203,433,000	210,403,000
Depreciation and amortization	2,855,000	3,083,000
Selling, general, and administrative expense	6,481,000	5,258,000
Operating income	$ 22,548,000	$ 21,286,000