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Subsequent Events - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Feb. 28, 2020
Jun. 03, 2019
Subsequent Event [Line Items]          
Cash Dividends payable, amount per share $ 0.10        
Cash Dividends payable, date to be paid Mar. 20, 2020        
Cash Dividends payable, record date Feb. 21, 2020        
Investment impairment   $ 15,000,000.0 $ 15,000,000    
Real War In [Member]          
Subsequent Event [Line Items]          
Equity method investments   $ 0 $ 0   $ 15,000,000.0
Subsequent Event | Real War In [Member]          
Subsequent Event [Line Items]          
Repayment of debt demanded       $ 25,000,000.0