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Senior Notes, Unsecured Revolving Credit Facility and Seller Financed Loans - Components of Seller Financed Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Seller financed loans $ 17,758 $ 2,434
Seller financed loan [Member]    
Debt Instrument [Line Items]    
Seller financed loans $ 17,758 $ 2,434