Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Supplemental cash flow information:
Interest paid, net of capitalized interest	$ 241,585	$ 217,716
Income taxes paid	4,433	2,920
Capitalized interest	5,734	3,704
Supplemental schedule of non-cash investing activities:
Accrued construction costs	57,143	33,162
Non-cash acquisitions and dispositions settled with receivables and restricted cash held in connection with Section 1031 transactions	129,846	254,301
Tenant funded tenant improvements owned by HCP	16,451	3,512
Supplemental schedule of non-cash financing activities:
Vesting of restricted stock units	288	379
Conversion of non-managing member units into common stock	5,022	2,244
Noncontrolling interest and other liabilities, net assumed in connection with the RIDEA III acquisition		61,219
Noncontrolling interest issued in connection with real estate acquisitions		3,885
Noncontrolling interest disposed in connection with real estate sales		204
Other liabilities assumed with real estate acquisitions	1,200	13,672
Unrealized (losses) on available-for-sale securities and derivatives designated as cash flow hedges, net	$ 343	$ (198)