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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
2 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Feb. 14, 2019
Sep. 09, 2018
Jun. 17, 2018
Mar. 25, 2018
Sep. 10, 2017
Jun. 18, 2017
Mar. 26, 2017
Dec. 30, 2018
Dec. 31, 2017
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Subsequent Event [Line Items]                        
Dividends declared per share   $ 0.55 $ 0.55 $ 0.55 $ 0.46 $ 0.46 $ 0.46 $ 0.55 $ 0.46 $ 2.20 $ 1.84 $ 1.52
Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Dividends declared per share $ 0.65                      
Dividend declaration date Feb. 20, 2019                      
Record date of dividend Mar. 15, 2019                      
Dividend payable date Mar. 29, 2019                      
Borrowings Repaid $ 15.0                      
Outstanding Borrowings Amount $ 50.0