Business Combinations, Discontinued Operations and Related Transactions - Recognition Based on Final Asset Allocation (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2014
Land held for development:
Current	$ 14.3us-gaap_RealEstateHeldforsale	$ 15.0us-gaap_RealEstateHeldforsale
Noncurrent	158.1us-gaap_RealEstateInvestmentPropertyNet	165.1us-gaap_RealEstateInvestmentPropertyNet
Basic Management Inc And Landwell
Consideration:
Cash	5.3
Total fair value of consideration	32.6
Fair value of our existing equity interest in BMI and LandWell	43.4
Bargain purchase gain recognized	28.0
Total	104.0
Allocation of purchase price to identifiable assets acquired and liabilities assumed:
Cash	27.4
Land held for development:
Current	14.3
Noncurrent	158.1
Other current assets	9.4
Property, plant and equipment	29.0
Other noncurrent assets	8.5
Long-term debt	(14.3)
Other liabilities	(66.9)
Total net identifiable assets	165.5
Noncontrolling interest in BMI and LandWell	(61.5)
Total	104.0
Basic Management Inc And Landwell \| Deferred Payment \| Present Value
Consideration:
Business combination consideration - liability incurred	8.2
Basic Management Inc And Landwell \| Promissory Note
Consideration:
Business combination consideration - liability incurred	$ 19.1

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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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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree.

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

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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