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Investment in TiO2 Manufacturing Joint Venture and Other Assets - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Assets Non Current [Line Items] |  |  |  |
Equity ownership percentage |  | 50.00% |  |
Indefinite-lived intangible asset |  | $ 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 |  | 6.3 | 6.6 | $ 6.5
Capitalized operating permits, net of amortization |  | 31.6 | $ 25.3 |
Capitalized Operating Permit Costs | Permits Subject to Amortization |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Amortization next fiscal year |  | 6.3 |  |
Amortization, year 2 |  | 6.3 |  |
Amortization, year 3 |  | 5.7 |  |
Amortization, year 4 |  | 5.3 |  |
Amortization, year 5 |  | 5.3 |  |
BMI |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Equity ownership percentage |  |  |  | 32.00%
BMI | Customer Relationships |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Indefinite-lived intangible asset |  | $ 5.1 |  |
LandWell |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Equity ownership percentage |  |  |  | 12.00%
LandWell | General Partner |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Indirect controlling interest in subsidiary |  |  |  | 50.00%
LPC |  |  |  |
Other Assets Non Current [Line Items] |  |  |  |
Purchase of TiO2 from the plant |  | 52.00% |  |

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