Derivative Instruments (Textual) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments [Abstract]
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months	$ 6,454
Derivative Cash Received On Hedge	$ 55,771	$ 56,842

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