Derivative Instruments (Textual) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments [Abstract]
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months	$ 3,395
Derivative Cash Received On Hedge	$ 8,218	$ 0

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

No definition available.

Name:	hcn_Cashflowhedgegainlosstobereclassifiedwithintwelvemonths2
Namespace Prefix:	hcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration