Quarterly report pursuant to Section 13 or 15(d)

Equity and Mezzanine Equity - Additional Information (Detail)

v3.20.2
Equity and Mezzanine Equity - Additional Information (Detail) - USD ($)
 9 Months Ended
Feb. 20, 2020
Sep. 30, 2020
Feb. 19, 2020
Jan. 29, 2020
Dec. 31, 2019
Jan. 11, 2019
Class of Stock [Line Items]            
Common stock, shares outstanding (in shares) 60,290,000 34,183,869 86,290,000   32,593,651  
Series D Preferred Stock            
Class of Stock [Line Items]            
Temporary equity, contract terms, minimum vote needed to trigger change in control from tender offer (as percent)   90.00%        
Preferred Stock | Series D Preferred Stock            
Class of Stock [Line Items]            
Redeemable preferred stock, dividend rate percentage (as percent)   7.00%        
Preferred Stock | Series E Preferred Stock            
Class of Stock [Line Items]            
Redeemable preferred stock, dividend rate percentage (as percent)   6.625%        
Preferred Stock | Series F Preferred Stock            
Class of Stock [Line Items]            
Redeemable preferred stock, shares issued (in shares)   45,102        
Consideration received   $ 1,000,000.0        
Maximum remaining capacity to sell common stock under open market sale agreement   $ 635,400,000        
Redeemable preferred stock, dividend rate percentage (as percent) 6.00%          
Redeemable preferred stock, shares authorized (in shares) 26,000,000          
Baird, Goldman Sachs, Stifel, Fifth Third, and U.S. Bancorp Investments, Inc. | Preferred Stock | Series E Preferred Stock            
Class of Stock [Line Items]            
Redeemable preferred stock, shares issued (in shares)   239,399        
Consideration received   $ 5,600,000        
Maximum aggregate sales price of shares to be issued under open market sale agreement   100,000,000.0        
Maximum remaining capacity to sell common stock under open market sale agreement   $ 94,400,000        
Common Stock ATM Program | Baird, Goldman Sachs, Stifel, Fifth Third, and U.S. Bancorp Investments, Inc. | Common Stock            
Class of Stock [Line Items]            
Redeemable preferred stock, shares issued (in shares)   1,600,000        
Consideration received   $ 32,400,000        
Maximum aggregate sales price of shares to be issued under open market sale agreement   250,000,000.0        
Maximum remaining capacity to sell common stock under open market sale agreement   204,600,000        
2019 Universal Shelf            
Class of Stock [Line Items]            
Universal registration statement, amount authorized   399,500,000       $ 500,000,000.0
2020 Universal Shelf            
Class of Stock [Line Items]            
Universal registration statement, amount authorized   $ 798,900,000   $ 800,000,000.0    
2020 Universal Shelf | Preferred Stock | Series F Preferred Stock            
Class of Stock [Line Items]            
Universal registration statement, amount authorized       $ 636,500,000