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Notes Receivable - Components of Notes Receivable (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable $ 60,378,000 $ 84,541,000 $ 103,705,000 $ 58,719,000
Other notes 3,100,000 3,000,000    
Tax Increment Financing Bonds ("TIF Bonds") 5,200,000 6,400,000    
Notes receivable , net $ 68,718,000 $ 93,905,000 $ 120,330,000  
Loans Receivable [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maturity Date September 2011 to November 2022      
Loans Receivable [Member] | Minimum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 5.70%      
Loans Receivable [Member] | Maximum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 14.00%      
Other Notes [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maturity Date November 2014 to September 2017      
Other Notes [Member] | Minimum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 8.50%      
Other Notes [Member] | Maximum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 12.00%      
Tax Increment Financing Bonds [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maturity Date April 2014 to July 2026      
Tax Increment Financing Bonds [Member] | Minimum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 5.50%      
Tax Increment Financing Bonds [Member] | Maximum [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest Rate 8.50%