Commitments and Contingencies - Approximate Percentage of TiO2 Sales by Volume for Segments (Detail) (TiO2, Geographic Concentration Risk, Net Sales)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Europe
Schedule Of Sales Revenue By Business Segment [Line Items]
Concentration risk percentage	50.00%	49.00%	47.00%
North America
Schedule Of Sales Revenue By Business Segment [Line Items]
Concentration risk percentage	33.00%	33.00%	35.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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