Annual report pursuant to Section 13 and 15(d)

Mandatorily-Redeemable Preferred Stock (Detail)

v3.20.4
Mandatorily-Redeemable Preferred Stock (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Sale of Stock [Line Items]      
Proceeds from issuance of preferred and common equity   $ 130,348 $ 118,357
Payments of legal costs   6,620 $ 9,186
Term preferred stock, fair value   $ 3,290  
Series A Preferred Stock      
Sale of Stock [Line Items]      
Preferred stock, dividend rate (as percent) 6.375%    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Weighted-average Offering Price Per Share $ 25.00    
Preferred stock, shares issued (in shares) 1,150,000 1,150,000 1,150,000
Proceeds from issuance of preferred and common equity $ 27,600    
Redemption price of redeemable preferred stock (in dollars per share)   $ 25.00  
Payments of legal costs 1,200    
Series A Preferred Stock | Preferred Stock      
Sale of Stock [Line Items]      
Proceeds from issuance of mandatorily-redeemable preferred stock $ 28,800 $ 28,800