The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Aggregate after tax gain consisting of: (1) In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination and (2) In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Amount of the item included in the third and fourth quarters that affected period-to-period comparability (excluding restatement adjustments), or the extraordinary item or unusual or infrequent item recognized in the third and fourth quarter in the absence of either a fourth-quarter report or disclosure in the annual report for the fourth quarter.

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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended							12 Months Ended		6 Months Ended	3 Months Ended					12 Months Ended	3 Months Ended	6 Months Ended				1 Months Ended
	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Net of Noncontrolling Interest	Mar. 31, 2013 Attributable to Parent	Dec. 31, 2012 Attributable to Parent	Jun. 30, 2012 Attributable to Parent	Dec. 31, 2013 Attributable to Parent Net of Tax	Sep. 30, 2013 Attributable to Parent Net of Tax	Dec. 31, 2012 Attributable to Parent Net of Tax	Dec. 31, 2013 Attributable to Parent Net of Tax BM and Landwell	Dec. 31, 2012 NL	Jun. 30, 2012 NL Certain Real Property Litigation Settlement	Sep. 30, 2013 NL Attributable to Parent Net of Tax	Dec. 31, 2012 NL Attributable to Parent Net of Tax	Jun. 30, 2012 NL Attributable to Parent Net of Tax Certain Real Property Litigation Settlement	Dec. 31, 2012 CompX	Sep. 30, 2012 CompX	Dec. 31, 2011 CompX	Dec. 31, 2012 CompX Attributable to Parent Net of Tax	Dec. 31, 2013 Kronos Worldwide, Inc.	Dec. 31, 2013 Kronos Worldwide, Inc. Unabsorbed Fixed Costs	Dec. 31, 2013 Kronos Worldwide, Inc. Foreign Pension Plan Defined Benefit Pension Curtailment Charge Canada	Dec. 31, 2013 Kronos Worldwide, Inc. Severance and Other Back-to-work Expenses	Jul. 31, 2013 Kronos Worldwide, Inc. Principal Prepayment Term Loan	Feb. 28, 2013 Kronos Worldwide, Inc. Principal Prepayment Term Loan
Loss on prepayment of debt						$ 3.4		$ 3.7		$ 1.2
Litigation settlement gain			14.7											14.7	17.9		7.8
Gain on securities transaction											13.2
Goodwill impairment			6.4				5.3
Assets held for sale write-down			1.2	1.1															0.4	1.1	0.8
Loss on sale		(0.5)	1.5	(0.9)									3.2			1.7		0.8
Incremental tax charge related to sale of TIMET common stock					6.1
Tax positions taken in current period		11.3	11.0	6.0	2.1
Provision for income taxes					2.7
Payment of Principal Amount																										100	290
Pre-tax charges of unabsorbed fixed production and other costs	7																					28	19	7	2
Insurance recoveries		9.4	3.3	16.9					4.7
Bargain purchase after-tax gain and remeasurement of existing investment												$ 46.6