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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ (37.5) | $ 25.7 | $ (28.9)
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | (34.3) | 19.2 | (20.3)
NL |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | (4.0) | 4.8 | (9.4)
CompX |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 1.2 | 1.1 | $ 0.8
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 0.1 | 0.3 |
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ (0.5) | $ 0.3 |

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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