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Investments in Real Estate - Schedule of Investments in Real Estate, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investments Schedule [Abstract]    
Building and building improvements $ 7,329,190 $ 2,815,348
Land and land improvements 1,738,731 574,253
Furniture, fixtures and equipment 164,618 64,080
Total 9,232,539 3,453,681
Accumulated depreciation (192,085) (47,126)
Investments in real estate, net $ 9,040,454 $ 3,406,555