Business Combinations - Recognition Based on Preliminary Analysis of Provisional Amounts (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013 Basic Management Inc And Landwell	Dec. 31, 2013 Basic Management Inc And Landwell Promissory note	Dec. 31, 2013 Basic Management Inc And Landwell Deferred payment Present value
Consideration:
Cash			$ 5.3
Business combination consideration - liability incurred				19.1	8.2
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	17.7	14.3	14.3
Noncurrent	156.5	158.1	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