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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 26, 2018
Mar. 31, 2018
Apr. 03, 2018
Subsequent Event [Line Items]      
Dividend declared, date   Apr. 03, 2018  
Dividend paid, date   Apr. 26, 2018  
Dividend record, date   Apr. 13, 2018  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividend per common share     $ 1.00
Dividend paid $ 46.5