Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Summary of segment information [Abstract]
Net sales	$ 602,919	$ 611,781
Cost of goods sold	508,715	511,393
Depreciation and amortization	11,039	10,555
Selling, general, and administrative expense	42,752	40,653
Asset impairments	3,035	0
Litigation settlement, net	(21,933)	0
Operating income	59,311	49,180
Interest expense	(5,379)	(6,954)
Other income (expense), net	278	(172)
Income before income taxes	54,210	42,054
Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	609,487	617,201
Operating Segments [Member] | Piping Systems [Member]
Summary of segment information [Abstract]
Net sales	385,013	376,492
Cost of goods sold	319,164	324,796
Depreciation and amortization	5,699	5,550
Selling, general, and administrative expense	20,439	17,897
Asset impairments	3,035
Litigation settlement, net	0
Operating income	36,676	28,249
Operating Segments [Member] | Industrial Metals [Member]
Summary of segment information [Abstract]
Net sales	131,202	150,875
Cost of goods sold	114,797	126,699
Depreciation and amortization	2,002	1,844
Selling, general, and administrative expense	3,221	3,145
Asset impairments	0
Litigation settlement, net	0
Operating income	11,182	19,187
Operating Segments [Member] | Climate [Member]
Summary of segment information [Abstract]
Net sales	93,272	89,834
Cost of goods sold	71,093	66,829
Depreciation and amortization	2,466	2,313
Selling, general, and administrative expense	6,699	8,306
Asset impairments	0
Litigation settlement, net	0
Operating income	13,014	12,386
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(6,568)	(5,420)
Cost of goods sold	3,661	(6,931)
Depreciation and amortization	872	848
Selling, general, and administrative expense	12,393	11,305
Asset impairments	0
Litigation settlement, net	(21,933)
Operating income	$ (1,561)	$ (10,642)