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Changes in Mortgage Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mortgage Loans On Real Estate [Abstract]      
Balance at beginning of period $ 209,566 $ 297,451 $ 442,826
Additions during period:      
Interest 18,285 20,807 28,116
Accretion of discount 0 0 269
Deductions during period:      
Provision for loan loss reserve (15,544) (11,422) (61,000)
Collections of principal and interest (92,177) (97,270) (112,760)
Balance at close of period $ 120,130 $ 209,566 $ 297,451