Real Estate and Other Activities - Summary of Joint Venture Designated as Held for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Real estate held for sale	$ 1,096,505
Straight-line rent receivables	728,522	$ 490,462
Other assets	333,480	256,069
Total Assets	20,519,801	$ 16,829,014
Massachusetts-based General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Real estate held for sale	1,096,505
Straight-line rent receivables	120,268
Other assets	4,234
Total Assets	$ 1,221,007