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Subsequent Events (Details)
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
building
Feb. 25, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 31, 2019
USD ($)
May 23, 2018
USD ($)
Feb. 26, 2018
USD ($)
Subsequent Event [Line Items]              
Repurchase of common stock     $ 350,710,000 $ 300,177,000      
Class A Common Stock              
Subsequent Event [Line Items]              
Repurchase of stock (in shares) | shares     61,418,000 23,371,000      
Stock repurchase, authorized amount           $ 300,000,000 $ 300,000,000
Industrial | Subsequent Event              
Subsequent Event [Line Items]              
Stock repurchase, authorized amount   $ 246,700,000          
Stock repurchase program, remaining authorized repurchase amount   $ 300,000,000          
Number of buildings acquired | building 54            
Number of buildings expected to close | building 4            
Acquisition price, buildings $ 1,160,000,000            
Line of credit,current borrowing capacity 142,000,000            
First mortgage debt secured by bulk industrial portfolio 235,000,000            
Industrial | Class A Common Stock | Subsequent Event              
Subsequent Event [Line Items]              
Repurchase of stock (in shares) | shares   652,311          
Repurchase of common stock   $ 3,200,000          
Stock repurchased, weighted average share price (USD per share) | $ / shares   $ 4.84          
Term Loan | Industrial | Subsequent Event              
Subsequent Event [Line Items]              
Floating rate unsecured term debt 500,000,000            
Line of Credit | Industrial | Subsequent Event              
Subsequent Event [Line Items]              
Maximum principal amount of credit facility $ 600,000,000       $ 400,000,000