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Business Segments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2012 West Group	Dec. 31, 2011 West Group	Dec. 31, 2010 Mideast Group	Dec. 31, 2010 Southeast Group
Segment Reporting Information [Line Items]
Reportable business segments	3
Land acquired through noncash transactions		$ 690,000	$ 144,961,000	$ 1,900,000	$ 450,000

The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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