Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2018 |
Oct. 01, 2017 |
Sep. 30, 2018 |
Oct. 01, 2017 |
Dec. 31, 2018 |
Aug. 31, 2018 |
May 31, 2018 |
Jan. 31, 2018 |
Aug. 31, 2017 |
May 31, 2017 |
Jan. 31, 2017 |
Dec. 31, 2016 |
|
Stockholders Equity Note Disclosure [Line Items] | ||||||||||||
Stock repurchase program, authorized amount | $ 500,000,000 | |||||||||||
Cumulative repurchases, value | $ 562,300 | $ 151,800,000 | ||||||||||
Cumulative repurchases, shares | 13.8 | 4.6 | ||||||||||
Common stock average price | $ 40.62 | $ 32.66 | ||||||||||
Dividends payable, amount per share | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.07 | $ 0.07 | $ 0.07 | ||||||
Dividend payment | $ 16,600,000 | $ 13,800,000 | $ 51,320,000 | $ 41,730,000 | ||||||||
Scenario, Forecast | ||||||||||||
Stockholders Equity Note Disclosure [Line Items] | ||||||||||||
Cumulative repurchases, value | $ 750,000,000 | |||||||||||
Maximum | ||||||||||||
Stockholders Equity Note Disclosure [Line Items] | ||||||||||||
Stock repurchase program, authorized amount | $ 1,500,000,000 |