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Merger Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2010
Aug. 18, 2009
Business Acquisition [Line Items]          
Fixed exchange ratio of Aquirer common stock to Aquiree common stock         0.975
Aquisition consideration transferred per share         $ 12.33
Finite-Lived Intangible Assets, Weighted-Average Useful Life 20        
Amortization of Acquired Intangible Assets $ 13,100,000 $ 13,100,000 $ 14,008,000    
Centex [Member]
          
Business Acquisition [Line Items]          
Acquired Intangible Assets         100,000,000
Amortization of Acquired Intangible Assets 5,000,000 5,000,000 5,900,000    
Goodwill Acquired in Business Combination       2,500,000 1,461,422,000
Acquired Deferred Tax Assets         1,300,000,000
Business Combination, Integration Related Costs     40,900,000    
Centex [Member] | Trade Names [Member]
          
Business Acquisition [Line Items]          
Acquired Intangible Assets         96,000,000
Centex [Member] | Other Intangible Assets [Member]
          
Business Acquisition [Line Items]          
Acquired Intangible Assets         $ 4,000,000