Investment in TiO2 Manufacturing Joint Venture and Other Assets - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2014	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Assets Non Current [Line Items]
Indefinite-lived intangible asset				$ 5.1
Contract related intangible asset impairment		$ 5.1	$ 5.1
Real Estate Management And Development | City Of Henderson
Other Assets Non Current [Line Items]
Delivery contract extended period			25 years
Water delivery contract revenue, percentage			70.00%
Real Estate Management And Development | Customer Relationships
Other Assets Non Current [Line Items]
Indefinite-lived intangible asset			$ 5.1
Contract related intangible asset impairment		$ 5.1	5.1
Collateral Trust
Other Assets Non Current [Line Items]
Decrease in restricted cash	$ 18.0
Capitalized Operating Permit Costs
Other Assets Non Current [Line Items]
Amortization of capitalized operating permit costs			6.2	6.3	$ 6.6
Capitalized operating permits, net of amortization			37.9	$ 31.6
Capitalized Operating Permit Costs | Permits Subject to Amortization
Other Assets Non Current [Line Items]
Amortization next fiscal year			6.2
Amortization, year 2			5.6
Amortization, year 3			5.1
Amortization, year 4			5.1
Amortization, year 5			$ 5.1
LPC
Other Assets Non Current [Line Items]
Purchase of TiO2 from the plant				52.00%