Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Summary of segment information [Abstract]
Net sales	$ 619,105	$ 608,602	$ 1,722,192	$ 1,886,777
Cost of goods sold	500,780	510,788	1,412,654	1,586,129
Depreciation and amortization	10,752	10,823	32,888	31,856
Selling, general, and administrative expense	38,346	40,739	114,714	121,838
Asset impairments	0	0	3,035	0
Litigation settlement, net	0	0	(21,933)	0
Operating income	69,227	46,252	180,834	146,954
Interest expense	(4,885)	(6,148)	(15,237)	(20,135)
Other income (expense), net	522	533	3,634	823
Income before income taxes	64,864	40,637	169,231	127,642
Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	625,849	617,298	1,744,102	1,904,164
Operating Segments [Member] | Piping Systems [Member]
Summary of segment information [Abstract]
Net sales	409,414	390,917	1,128,467	1,193,274
Cost of goods sold	339,904	330,418	931,339	1,019,546
Depreciation and amortization	5,362	5,751	16,517	16,953
Selling, general, and administrative expense	19,285	18,738	54,963	56,620
Asset impairments			3,035
Litigation settlement, net			0
Operating income	44,863	36,010	122,613	100,155
Operating Segments [Member] | Industrial Metals [Member]
Summary of segment information [Abstract]
Net sales	118,831	135,443	338,652	434,037
Cost of goods sold	95,717	117,893	285,788	372,542
Depreciation and amortization	1,774	1,836	5,771	5,518
Selling, general, and administrative expense	2,992	3,115	8,690	9,280
Asset impairments			0
Litigation settlement, net			0
Operating income	18,348	12,599	38,403	46,697
Operating Segments [Member] | Climate [Member]
Summary of segment information [Abstract]
Net sales	97,604	90,938	276,983	276,853
Cost of goods sold	70,450	70,523	206,083	212,201
Depreciation and amortization	2,547	2,491	7,770	6,932
Selling, general, and administrative expense	6,451	9,961	19,607	24,336
Asset impairments			0
Litigation settlement, net			0
Operating income	18,156	7,963	43,523	33,384
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(6,744)	(8,696)	(21,910)	(17,387)
Cost of goods sold	(5,291)	(8,046)	(10,556)	(18,160)
Depreciation and amortization	1,069	745	2,830	2,453
Selling, general, and administrative expense	9,618	8,925	31,454	31,602
Asset impairments			0
Litigation settlement, net			(21,933)
Operating income	$ (12,140)	$ (10,320)	$ (23,705)	$ (33,282)