Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Thousands						9 Months Ended
	Nov. 08, 2019 USD ($) shares	Nov. 05, 2019 USD ($) Hospital Health_Center RenewalOption Lease	Oct. 25, 2019 USD ($)	Aug. 23, 2019 USD ($)	Jul. 18, 2019 USD ($) shares	Sep. 30, 2019 USD ($) Hospital $ / shares shares	Nov. 04, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Subsequent Event [Line Items]
Purchase price of acquisition | $				$ 1,400,000
Term of lease extension, years						5 years
Common stock, par value | $ / shares						$ 0.001		$ 0.001
Common stock, shares authorized | shares						500,000,000		500,000,000
Common stock, shares issued | shares						459,778,000		370,637,000
Proceeds from sale of common shares, net of offering costs | $						$ 1,507,363
Public Offering [Member]
Subsequent Event [Line Items]
Common stock, shares issued | shares					51,750,000
Additional shares purchased by underwriters | shares					6,750,000
Proceeds from sale of common shares, net of offering costs | $					$ 858,100
Acute Care Hospital [Member]
Subsequent Event [Line Items]
Number of facilities acquired | Hospital						3
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of hospitals sold | Hospital		2
Proceeds from sale of facilities | $		$ 93,000
Common stock, par value | $ / shares							$ 0.001
Common stock, shares authorized | shares							750,000,000
Subsequent Event [Member] | Public Offering [Member]
Subsequent Event [Line Items]
Common stock, shares issued | shares	57,500,000
Additional shares purchased by underwriters | shares	7,500,000
Proceeds from sale of common shares, net of offering costs | $	$ 1,026,000
Subsequent Event [Member] | Acute Care Hospital [Member]
Subsequent Event [Line Items]
Number of facilities acquired | Health_Center		10
Purchase price of acquisition | $		$ 700,000
Subsequent Event [Member] | Acute Care Hospital [Member] | Clear Lake, Texas [Member]
Subsequent Event [Line Items]
Estimated total development cost | $			$ 27,500
Subsequent Event [Member] | Life Point [Member]
Subsequent Event [Line Items]
Number of master leases | Lease		1
Term of lease		20 years
Number of lease extension options | RenewalOption		2
Lease extension options, description		two five-year extension options
Existence of option to extend		true
Term of lease extension, years		5 years
Fixed annual escalators percentage		2.00%
Annual cap percentage		4.00%