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Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Mortgage Loans on Real Estate [Roll Forward]      
Balance at beginning of period $ 5,900 $ 5,600 $ 0
New mortgage loans 0 300 5,600
Collections of principal (5,900) 0 0
Balance at end of period $ 0 $ 5,900 $ 5,600