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Notes Receivable - Loans Receivable on Real Estate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Balance at January 1 $ 19,675 $ 49,488  
Additions:      
Interest 1,839 2,276  
Accretion of discount 0 269 $ 1,038
Deductions:      
Collections of principal and interest (1,839) (32,358)  
Balance at December 31 $ 19,675 $ 19,675 $ 49,488