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Changes in Mortgage Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mortgage Loans On Real Estate [Abstract]      
Balance at beginning of period $ 437,144 $ 357,754 $ 143,989
Additions during period:      
New mortgage loans 11,139 82,634 300,000
Interest 8,559 7,212 6,120
Accretion of discount 1,038 980 926
Deductions during period:      
Provision for loan loss reserve 0 0 (500)
Collections of principal and interest (15,054) (11,436) (92,781)
Balance at close of period $ 442,826 $ 437,144 $ 357,754