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Notes Receivable - Loans Receivable on Real Estate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]      
Balance at January 1 $ 49,488 $ 41,988  
Additions:      
New mortgage loans 0 11,139  
Interest 2,276 3,160  
Accretion of discount 269 1,038 $ 980
Deductions:      
Collections of principal and interest (32,358) (7,837)  
Balance at December 31 $ 19,675 $ 49,488 $ 41,988