Segments - Schedule of Net Sales From External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Net sales	$ 521,261	$ 564,906	$ 1,531,609	$ 1,639,689
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Change in net sales	$ (43,645)		$ (108,080)
Percentage change in net sales	(7.70%)		(6.60%)
Wallboard
Revenue from External Customer [Line Items]
Net sales	$ 199,448	$ 207,326	$ 590,304	$ 624,299
Percentage of net sales	38.30%	36.70%	38.50%	38.10%
Change in net sales	$ (7,878)		$ (33,995)
Percentage change in net sales	(3.80%)		(5.40%)
Suspended ceiling systems
Revenue from External Customer [Line Items]
Net sales	$ 97,323	$ 118,873	$ 287,337	$ 314,045
Percentage of net sales	18.70%	21.00%	18.80%	19.20%
Change in net sales	$ (21,550)		$ (26,708)
Percentage change in net sales	(18.10%)		(8.50%)
Metal framing
Revenue from External Customer [Line Items]
Net sales	$ 90,333	$ 98,817	$ 265,855	$ 300,493
Percentage of net sales	17.30%	17.50%	17.40%	18.30%
Change in net sales	$ (8,484)		$ (34,638)
Percentage change in net sales	(8.60%)		(11.50%)
Complementary and other products
Revenue from External Customer [Line Items]
Net sales	$ 134,157	$ 139,890	$ 388,113	$ 400,852
Percentage of net sales	25.70%	24.80%	25.30%	24.40%
Change in net sales	$ (5,733)		$ (12,739)
Percentage change in net sales	(4.10%)		(3.20%)