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Condensed Combined Statement of Income for Limited Liabilities Accounted for under Equity Method (Parenthetical) (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]          
Advances payable to us $ 21,855,000   $ 21,855,000   $ 22,489,000
Arlington Medical Properties          
Schedule Of Equity Method Investments [Line Items]          
Interest income earned on various advances made to LLCs 291,000 $ 0 880,000 $ 0  
Advances payable to us $ 21,800,000   $ 21,800,000    
Percentage of minority ownership purchased from third-party members 10.00%   10.00%    
Cash payment made purchased addition of ownership interest     85.00%   75.00%