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Quarterly results (unaudited) (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Unaudited Quarterly Information [Abstract]                      
Land and community valuation adjustments $ 11,043,000 $ 1,494,000 $ 3,300,000 $ 103,000 $ 82,186,000 $ 57,453,000 $ 25,546,000 $ 4,537,000 $ 15,940,000 $ 169,722,000 $ 751,206,000
Net realizable value adjustments - land held for sale 9,900,000 100,000 (200,000) 0 38,100,000 600,000 (200,000) 600,000 9,844,000 39,128,000 113,737,000
Write-off of deposits and pre-acquisition costs 3,400,000 2,300,000 3,700,000 600,000 1,600,000 1,100,000 2,300,000 500,000 10,002,000 5,594,000 54,256,000
Impairments of investments in unconsolidated joint ventures               1,908,000 0 1,908,000 54,090,000
Goodwill impairments   240,541,000       654,900,000 1,400,000   240,541,000 656,298,000 562,990,000
Adjustment to self insurance reserves         $ (11,400,000) $ 272,200,000 $ 9,600,000 $ 10,000,000   $ 280,400,000