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Changes in Mortgage Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mortgage Loans On Real Estate [Abstract]      
Balance at beginning of period $ 297,451 $ 442,826 $ 437,144
Additions during period:      
New mortgage loans 0 0 11,139
Interest 20,807 28,116 36,499
Accretion of discount 0 269 1,038
Deductions during period:      
Provision for loan loss reserve (11,422) (61,000) 0
Collections of principal and interest (97,270) (112,760) (42,994)
Balance at close of period $ 209,566 $ 297,451 $ 442,826