Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Summary of segment information [Abstract]
Net sales	$ 611,781	$ 640,060
Cost of goods sold	511,393	545,670
Depreciation and amortization	10,555	9,456
Selling, general, and administrative expense	40,653	34,057
Asset impairment	0	3,469
Operating income	49,180	47,408
Interest expense	(6,954)	(5,909)
Other income (expense), net	(172)	560
Income before income taxes	42,054	42,059
Operating Segments [Member]
Summary of segment information [Abstract]
Net sales	617,201	644,359
Operating Segments [Member] | Piping Systems [Member]
Summary of segment information [Abstract]
Net sales	376,492	430,964
Cost of goods sold	324,796	372,895
Depreciation and amortization	5,550	5,878
Selling, general, and administrative expense	17,897	19,242
Asset impairment		0
Operating income	28,249	32,949
Operating Segments [Member] | Industrial Metals [Member]
Summary of segment information [Abstract]
Net sales	150,875	177,332
Cost of goods sold	126,699	149,423
Depreciation and amortization	1,844	1,903
Selling, general, and administrative expense	3,145	3,373
Asset impairment		0
Operating income	19,187	22,633
Operating Segments [Member] | Climate [Member]
Summary of segment information [Abstract]
Net sales	89,834	36,063
Cost of goods sold	66,829	27,286
Depreciation and amortization	2,313	621
Selling, general, and administrative expense	8,306	2,609
Asset impairment		0
Operating income	12,386	5,547
Corporate and Eliminations [Member]
Summary of segment information [Abstract]
Net sales	(5,420)	(4,299)
Cost of goods sold	(6,931)	(3,934)
Depreciation and amortization	848	1,054
Selling, general, and administrative expense	11,305	8,833
Asset impairment		3,469
Operating income	$ (10,642)	$ (13,721)