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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Sep. 07, 2018
May 31, 2020
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 16, 2019
Stockholders Equity [Line Items]                
Common stock warrants exercised (in shares)             402,708  
Remaining warrants expired without being exercised (in shares) 11,955              
Authorized capital stock (in shares)               405,000,000
Common stock, shares authorized (in shares)         400,000,000 400,000,000   400,000,000
Common stock, par value (in dollars per share)         $ 0.50 $ 0.50   $ 0.50
Preferred stock, authorized capital stock (in shares)         5,000,000 5,000,000   5,000,000
Preferred stock, par value (in dollars per share)               $ 10.00
Issuance of common stock     $ 0 $ 0 $ 206,626 $ 300,000    
Over-Allotment Option                
Stockholders Equity [Line Items]                
Issuance of common stock (in shares)   41,325,000            
Issuance of common stock   $ 196,500