Restructuring and Divestiture Costs - Chlorovinyls - Additional Information (Detail) - USD ($)		3 Months Ended
	Feb. 24, 2016	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Loss on sale of business		$ 19,900,000
Solucor [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of assets	$ 9,200,000
Chlorovinyls [Member]
Restructuring Cost and Reserve [Line Items]
Severance cost		10,100,000	$ 0
Non-cash asset write-downs		19,900,000	$ 0
Chlorovinyls [Member] | Solucor [Member]
Restructuring Cost and Reserve [Line Items]
Loss on sale of business		(15,900,000)
Building Products [Member]
Restructuring Cost and Reserve [Line Items]
Severance cost		2,100,000
Non-cash asset write-downs		400,000
Building Products [Member] | Concord Ontario Member
Restructuring Cost and Reserve [Line Items]
Loss on sale of business		$ (4,000,000)