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Summary of Significant Accounting Policies - Adoption of New Revenue Recognition Guidance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred asset management fee income   $ 3,200 $ 2,700    
Retained earnings (accumulated deficit)   (2,018,302) (1,165,412)    
Net cash provided by operating activities   506,965 582,546 $ 405,172  
Net cash provided by (used in) investing activities   (268,213) 1,666,387 215,457  
Net cash used in financing activities   (788,404) (1,364,381) (491,251)  
Accounting Standards Update 2016-01          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings (accumulated deficit) $ 600        
Available-for-sale securities, gross unrealized gain 200        
Asset management fees | Difference between revenue guidance in effect before and after Topic 606 | ASU 2014-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred asset management fee income $ 1,600        
Asset Management | Difference between revenue guidance in effect before and after Topic 606 | ASU 2014-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenue from contract with customer   $ 700      
Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net cash provided by operating activities     549,617 408,361  
Net cash provided by (used in) investing activities     1,331,542 251,812  
Net cash used in financing activities     $ (1,346,505) $ (465,957)  
Subsequent Event | Minimum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Discounted estimated incremental borrowing rate         5.00%
Subsequent Event | Maximum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Discounted estimated incremental borrowing rate         5.80%
Office leases | Subsequent Event | Minimum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability, estimated adjustment         $ 55,000
Office leases | Subsequent Event | Maximum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability, estimated adjustment         65,000
Ground Leases | Subsequent Event | Minimum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability, estimated adjustment         65,000
Ground Leases | Subsequent Event | Maximum | Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Lease liability, estimated adjustment         $ 75,000