Real Estate Activities - Adeptus Health - Additional Information (Detail) $ in Thousands						1 Months Ended		12 Months Ended
	Dec. 31, 2018 Property	Dec. 07, 2017 USD ($) Lease	Oct. 18, 2017 RenewalOption	Oct. 02, 2017 Facility	Mar. 31, 2017 USD ($)	Oct. 31, 2018 Facility	Aug. 31, 2018 Facility	Dec. 31, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 04, 2017 USD ($)
Business Acquisition [Line Items]
Real estate impairment charge								$ 18,002	$ 5,340	$ 3,063
Gain offset by non-cash charges					$ 600
Colorado [Member] | University of Colorado Hospital [Member]
Business Acquisition [Line Items]
Number of leased properties | Lease		11
Total budgeted investment		$ 60,000
Term of lease, years		15 years
Number of lease extension options | Lease		3
Term of lease extension, years		5 years
Lease rent increase percentage		2.00%
Louisiana [Member] | Ochsner [Member]
Business Acquisition [Line Items]
Total budgeted investment											$ 25,000
Term of lease, years			15 years
Number of lease extension options | RenewalOption			3
Term of lease extension, years			5 years
Gain offset by non-cash charges								500
Average minimum lease rate on development and construction cost			9.20%
Adeptus Health [Member]
Business Acquisition [Line Items]
Number of properties closed | Property	14
Amortization of straight line rent receivables, reduction in rent revenue								$ 6,100
Number of facilities transitioned | Facility				16
Number of properties re-leased | Facility						5	3
Number of transitioned facilities not re-leased | Facility								7
Percentage of investment in remaining transition facilities on total assets								0.50%
Real estate impairment charge								$ 18,000