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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% |

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