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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Apr. 17, 2018
May 16, 2018
Scenario Forecast [Member]    
Subsequent Event [Line Items]    
Quarterly dividend payable subsequent to balance sheet date   $ 4.3
Subsequent Events [Member]    
Subsequent Event [Line Items]    
Dividend declaration date Apr. 17, 2018  
Common stock dividends per share declared $ 0.09  
Dividend record date May 02, 2018  
Dividend payment date May 16, 2018