Discontinued Operations and Held for Sale Businesses - Additional Information (Details)	1 Months Ended	0 Months Ended
	Jul. 31, 2011 Ready-Mix Concrete Property	Dec. 04, 2012 Subsequent Event Ready-Mix Concrete Property	Dec. 04, 2012 Subsequent Event Aggregates Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of assets acquired in noncash asset exchange	3	42	2