Segments - Schedule of Net Sales From External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Net sales	$ 604,973	$ 529,230	$ 1,141,270	$ 1,008,687
Change in Net Sales	$ 75,743		$ 132,583
Percentage Change in Net Sales	14.30%		13.14412%
Gross Profit	$ 169,097	$ 149,532	$ 323,537	$ 289,443
Change in Gross Profit	$ 19,565		$ 34,094
Percentage Change in Gross Profit	13.10%		11.77918%
Gross Margin Percentage	28.00%	28.30%	28.30%	28.70%
Percentage Change in Gross Margin	(0.30%)		(0.40%)
SBP
Revenue from External Customer [Line Items]
Net sales	$ 522,219	$ 460,086	$ 985,879	$ 878,549
Percentage of Net Sales	100.00%	100.00%	100.00%	100.00%
Change in Net Sales	$ 62,133		$ 107,330
Percentage Change in Net Sales	13.50%		12.21673%
Gross Profit	$ 146,267	$ 130,729	$ 280,704	$ 253,155
Change in Gross Profit	$ 15,538		$ 27,549
Percentage Change in Gross Profit	11.90%		10.88227%
Gross Margin Percentage	28.00%	28.40%	28.50%	28.80%
Percentage Change in Gross Margin	(0.40%)		(0.30%)
SBP | Wallboard
Revenue from External Customer [Line Items]
Net sales	$ 198,598	$ 180,955	$ 379,251	$ 349,195
Percentage of Net Sales	38.00%	39.30%	38.50%	39.70%
Change in Net Sales	$ 17,643		$ 30,056
Percentage Change in Net Sales	9.70%		8.60723%
SBP | Suspended ceiling systems
Revenue from External Customer [Line Items]
Net sales	$ 97,755	$ 83,271	$ 183,933	$ 155,988
Percentage of Net Sales	18.70%	18.10%	18.70%	17.80%
Change in Net Sales	$ 14,484		$ 27,945
Percentage Change in Net Sales	17.40%		17.91484%
SBP | Metal framing
Revenue from External Customer [Line Items]
Net sales	$ 91,476	$ 72,404	$ 165,443	$ 141,065
Percentage of Net Sales	17.50%	15.70%	16.80%	16.10%
Change in Net Sales	$ 19,072		$ 24,378
Percentage Change in Net Sales	26.30%		17.2814%
SBP | Complementary and other products
Revenue from External Customer [Line Items]
Net sales	$ 134,390	$ 123,456	$ 257,252	$ 232,301
Percentage of Net Sales	25.80%	26.90%	26.00%	26.40%
Change in Net Sales	$ 10,934		$ 24,951
Percentage Change in Net Sales	8.90%		10.74081%
Mechanical Insulation
Revenue from External Customer [Line Items]
Net sales	$ 82,754	$ 69,144	$ 155,391	$ 130,138
Percentage of Net Sales	100.00%	100.00%	100.00%	100.00%
Change in Net Sales	$ 13,610		$ 25,253
Percentage Change in Net Sales	19.70%		19.40%
Gross Profit	$ 22,830	$ 18,803	$ 42,833	$ 36,288
Change in Gross Profit	$ 4,027		$ 6,545
Percentage Change in Gross Profit	21.40%		18.03627%
Gross Margin Percentage	27.60%	27.20%	27.60%	27.90%
Percentage Change in Gross Margin	0.40%		(0.30%)