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Business combinations, discontinued operations and related transactions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2012 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 31, 2011 Kronos Worldwide, Inc. [Member] | Dec. 31, 2010 Kronos Worldwide, Inc. [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] | Dec. 31, 2012 CompX [Member] | Dec. 31, 2012 CompX [Member] Discontinued operations [Member] | Dec. 31, 2012 Class A [Member] CompX [Member] | Nov. 30, 2010 Secondary Public Common Stock Offering [Member] Kronos Worldwide, Inc. [Member] | Nov. 30, 2010 Secondary Public Common Stock Offering [Member] Kronos Worldwide, Inc. [Member] NL [Member]
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secondary public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,940,000 |
Net proceeds from new issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 337.6 |
Public offering price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 |
Percentage of underwriting discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |
Underwriting discount price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.15 |
Cost of offerings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |
Total controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 87.00% |  |  | 80.00% |
Direct controlling interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  | 50.00%
Indirect controlling interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  | 30.00% |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Shares available for purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  | 678,000 |  |
Stock split | 3-for-1 |  |  |  |  |  |  |  |  |  |  |  | 2-for-1 |  |  |  |  |  |  |
Sale of Furniture Components segment |  |  |  |  |  |  |  |  |  | 58.0 | 0.3 | 0.5 |  |  |  |  | 58.0 |  |  |
Gain on sale of discontinued operations |  |  |  |  |  |  |  |  |  | 23.7 |  |  |  |  |  |  | 23.7 |  |  |
Gain on sale discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.7 |  |  |
Net income tax gain from disposal of discontinued operation per basic and diluted share |  | $ 0.01 | $ 0.07 | $ 0.13 | $ 0.26 | $ 0.16 | $ 0.21 | $ 0.15 | $ 0.11 | $ 0.47 | $ 0.64 | $ 0.14 |  |  |  |  | $ 0.05 |  |  |
Reclassification out of AOCI, foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (7.2) |  |  |  | 9.0 |  |  | 10.4 |  |  |
Statutory income tax rate of foreign tax credit |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |  |  |  | 35.00% |  |  |  |
Promissory notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.0 |  |  |

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