Business Combinations, Discontinued Operations and Related Transactions - Recognition Based on Preliminary Analysis of Provisional Amounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Land held for development:
Current	$ 14.3
Noncurrent	158.1
Basic Management Inc And Landwell
Consideration:
Cash	5.3
Total fair value of consideration	32.6
Fair value of existing equity interest in BMI and Landwell	43.4
Bargain purchase gain recognized	28.0
Preliminary total	104.0
Preliminary 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)
Preliminary total	104.0
Basic Management Inc And Landwell | Promissory note
Consideration:
Promissory note payable	19.1
Basic Management Inc And Landwell | Deferred payment | Present Value
Consideration:
Promissory note payable	$ 8.2