Real Estate Intangibles - Summary of Real Estate Intangible Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Rental income related to (above)/below market tenant leases, net	$ (155)	$ (351)
Amortization related to in place lease intangibles and lease commissions	$ (24,905)	$ (32,261)

Depreciation and amortization related to in place lease intangibles and lease commissions

No definition available.

Name:	well_DepreciationAmortizationRelatedToInPlaceLeaseIntangiblesAndLeaseCommissions
Namespace Prefix:	well_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration