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Notes Receivable - Loans Receivable on Real Estate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]      
Balance at January 1 $ 52,444 $ 72,218  
Additions:      
Interest 0 810  
Accretion of discount 980 926 $ 874
Deductions:      
Collections of principal and interest (11,436) (460)  
Loan loss reserve 0 (500) 0
Other 0 (20,550)  
Balance at December 31 $ 41,988 $ 52,444 $ 72,218