Area of land held.

No definition available.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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 consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The aggregate gain recognized consisting of: (1) In a business combination achieved in stages, 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), the amount of gain recognized by the entity.

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No definition available.

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Business combinations discontinued operations and related transactions.

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No definition available.

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Deferred payment obligation fair value disclosure.

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Controlling interest in subsidiary held directly by parent.

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Controlling interest in subsidiary held indirectly through controlled subsidiary of parent.

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Minority interest controlling percentage in subsidiary by parent.

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Business Combinations, Dispositions and Related Transactions - Additional Information (Detail) $ in Millions		12 Months Ended
	Nov. 18, 2015 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) a shares	Nov. 30, 2013	Dec. 31, 2012 shares
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Equity ownership percentage		50.00%
Land held for development at an aggregate fair value		$ 157.2	$ 165.1
Gain on bargain purchase and remeasurement of our existing investment in acquiree				$ 54.6
Residential/Planned Community Purposes
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Land held for development \| a				2,100
Commercial and Light Industrial Use
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Land held for development \| a				400
Basic Management Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Equity ownership percentage				32.00%
Indirect controlling interest in subsidiary				50.00%
Business acquisition, percentage of voting interests acquired				31.00%
Ownership interest in subsidiary				63.00%
LandWell
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Equity ownership percentage				12.00%
Business acquisition, percentage of voting interests acquired				15.00%
Direct controlling interest in subsidiary				27.00%
LandWell \| Aggregate General And Limited Interests
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Controlling interest in subsidiary				77.00%
LandWell \| General Partner
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Ownership interest in subsidiary				50.00%
Basic Management Inc And Landwell
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Total fair value of consideration				$ 32.6
Fair value of consideration, cash				5.3
Recognized pre-tax gain on business combination				26.6
Business acquisition estimated fair value				43.4
Business acquisition at carrying value				16.8
Bargain purchase gain recognized				28.0
Land held for development at an aggregate fair value				158.1
Gain on bargain purchase and remeasurement of our existing investment in acquiree				54.6
Basic Management Inc And Landwell \| Promissory Note
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Business combination consideration transferred, liabilities incurred				$ 19.1
Interest rate				3.00%
Principal prepayments of note		$ 3.0	$ 1.7
Basic Management Inc And Landwell \| Face Value \| Deferred Payment
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Business combination consideration transferred, liabilities incurred				$ 11.1
Business combination consideration transferred, deferred payment obligation				$ 11.1
Interest rate				3.00%
Basic Management Inc And Landwell \| Present Value \| Deferred Payment
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Business combination consideration transferred, liabilities incurred				$ 8.2
Business combination consideration transferred, deferred payment obligation				$ 8.2
Discount rate				3.00%
Certain Real Property and Option to Acquire Remaining Parcels
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Land held for development at an aggregate fair value				$ 14.9
Kronos Worldwide, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Repurchase of common stock \| shares						2,000,000
Repurchased shares \| shares				49,000
Repurchased shares, value				$ 0.7
Shares available for purchase \| shares		1,950,000
Indirect controlling interest in subsidiary		30.00%
Direct controlling interest in subsidiary		50.00%
CompX \| Class A
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Shares available for purchase \| shares		678,000
Entity One \| Basic Management Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					32.00%
Entity One \| LandWell
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					21.00%
Nevada Environmental Response Trust \| Basic Management Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					31.00%
Nevada Environmental Response Trust \| LandWell
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					15.00%
Entity Three \| Basic Management Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					5.00%
Entity Three \| LandWell
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Noncontrolling interest, ownership percentage					2.00%
WCS \| Divestiture Terms Pending
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Proceeds from sale of subsidiary	$ 270.0
Amount of consideration received in shares	$ 20.0