Leases - Schedule of Components of Operating Lease Income from Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Leases Lease Income [Abstract]
Fixed lease payments	$ 262,043	$ 134,567	$ 674,780	$ 323,334
Variable lease payments	28,410	18,271	75,542	42,879
Rental revenue	$ 290,453	$ 152,838	$ 750,322	$ 366,213