Earnings Per Share - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Oct. 30, 2018	Jul. 26, 2018	Feb. 23, 2018
Earnings Per Share Disclosure [Line Items]
Increase in dividend rate, percentage					5.00%
Cash dividend, amount per share (in dollars per share)				$ 0.335	$ 0.335
Payment for repurchase of common stock	$ 500,000	$ 250,000
Stock repurchased and retired during period, value	$ 500,000	$ 250,000
Number of shares authorized to be repurchased (in shares)	15,000,000
Shares available for repurchase (in shares)	7,993,299
Subsequent Event
Earnings Per Share Disclosure [Line Items]
Cash dividend, amount per share (in dollars per share)			$ 0.335
May 2018 Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Payment for repurchase of common stock	$ 250,000
Repurchase of common stock shares (in shares)	2,680,704
August 2018 Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Payment for repurchase of common stock	$ 250,000
Repurchase of common stock shares (in shares)	1,984,914
Stock repurchased and retired during period, value	$ 200,000
Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Repurchase of common stock shares (in shares)	4,665,618