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Revenue Recognition (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018 USD ($) day	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($) day	Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10		10
Net sales	$ 859,776	$ 479,318	$ 2,190,215	$ 1,381,927
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	685,468	361,992	1,723,103	1,034,580
Direct
Disaggregation of Revenue [Line Items]
Net sales	153,847	89,242	402,420	274,482
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	32,116	35,915	95,300	95,817
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(11,655)	(7,831)	(30,608)	(22,952)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	387,347	228,424	1,016,806	633,036
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	481,946	254,476	1,185,332	758,788
Other | Other
Disaggregation of Revenue [Line Items]
Net sales	$ (9,517)	$ (3,582)	$ (11,923)	$ (9,897)

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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