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Notes Receivable - Summary of Activity in Loan Loss Reserve (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable, net $ 42,534 $ 56,245 $ 78,338
Gain on disposition of real estate, net of tax 167,571 3,060 467
Aggregate write down in the loan loss reserve 15,606 $ 0 $ 0
Sale of Note Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Face value of note receivable sold, including accrued interest 9,800    
Notes receivable, net 5,000    
Proceeds from sale of notes receivable 7,900    
Loan loss reserve 4,800    
Gain on disposition of real estate, net of tax 2,900    
Write off a cross collateralized note receivable, including accrued interest 10,800    
Aggregate write down in the loan loss reserve $ 15,606