Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.8.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 26, 2018
Dec. 31, 2017
Jan. 03, 2018
Subsequent Event [Line Items]      
Dividend declared, date   Jan. 03, 2018  
Dividend paid, date   Jan. 26, 2018  
Dividend record, date   Jan. 16, 2018  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividend per common share     $ 1.00
Dividend paid $ 46.5