Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Summary of segment information [Abstract]
Net sales	$ 500,168	$ 666,394	$ 1,103,087	$ 1,278,175
Cost of goods sold	403,159	563,948	911,874	1,075,341
Depreciation and amortization	11,097	10,478	22,136	21,033
Selling, general, and administrative expense	33,616	40,446	76,368	81,099
Asset impairments	0	0	3,035	0
Litigation settlement, net	0	0	(21,933)	0
Operating income	52,296	51,522	111,607	100,702
Interest expense	(4,973)	(7,033)	(10,352)	(13,987)
Other income (expense), net	2,834	462	3,112	290
Income before income taxes	50,157	44,951	104,367	87,005
Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	508,766	669,665	1,118,253	1,286,866
Operating Segments [Member] | Piping Systems [Member]
Summary of segment information [Abstract]
Net sales	334,040	425,865	719,053	802,357
Cost of goods sold	272,271	364,332	591,435	689,128
Depreciation and amortization	5,456	5,652	11,155	11,202
Selling, general, and administrative expense	15,239	19,985	35,678	37,882
Asset impairments			3,035
Litigation settlement, net			0
Operating income	41,074	35,896	77,750	64,145
Operating Segments [Member] | Industrial Metals [Member]
Summary of segment information [Abstract]
Net sales	88,619	147,719	219,821	298,594
Cost of goods sold	75,274	127,950	190,071	254,649
Depreciation and amortization	1,995	1,838	3,997	3,682
Selling, general, and administrative expense	2,477	3,020	5,698	6,165
Asset impairments			0
Litigation settlement, net			0
Operating income	8,873	14,911	20,055	34,098
Operating Segments [Member] | Climate [Member]
Summary of segment information [Abstract]
Net sales	86,107	96,081	179,379	185,915
Cost of goods sold	64,540	74,849	135,633	141,678
Depreciation and amortization	2,757	2,128	5,223	4,441
Selling, general, and administrative expense	6,457	6,069	13,156	14,375
Asset impairments			0
Litigation settlement, net			0
Operating income	12,353	13,035	25,367	25,421
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(8,598)	(3,271)	(15,166)	(8,691)
Cost of goods sold	(8,926)	(3,183)	(5,265)	(10,114)
Depreciation and amortization	889	860	1,761	1,708
Selling, general, and administrative expense	9,443	11,372	21,836	22,677
Asset impairments			0
Litigation settlement, net			(21,933)
Operating income	$ (10,004)	$ (12,320)	$ (11,565)	$ (22,962)