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Notes Receivable - Loans Receivable on Real Estate (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Receivables [Abstract]    
Balance at January 1 $ 49,488 $ 41,988
Additions:    
New mortgage loans 0 6,802
Interest 1,826 2,306
Accretion of discount 269 773
Deductions:    
Collections of principal and interest (32,004) (7,090)
Balance at September 30 $ 19,579 $ 44,779