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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]      
Income tax adjustment $ 27,900    
Rate change - decrease in valuation allowance 380,990   $ 408,903
Tax credit valuation allowance   $ 207  
Gross unrecognized tax benefits 18,400   18,300
Penalties and interest accrued 100   100
Healthpeak      
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance (117,600)    
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 812,000   1,200,000
Operating loss carryforwards, indefinite lived 181,100   174,900
Federal and state      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards valuation allowance 328,400   318,400
Tax credit valuation allowance 50,300   50,300
Change in valuation allowance   $ (5,919)  
Capital loss carryforward | Federal and state      
Operating Loss Carryforwards [Line Items]      
Tax credit valuation allowance $ 2,300   $ 40,700