Stock-based Compensation Expense and Share Repurchase Programs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2019	Jan. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Amount of shares repurchased	$ 12,105	$ 92,004	$ 167,954	$ 211,038
Share Repurchase Program 2018
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased	500,000,000.0		500,000,000.0			500,000,000.0
Shares repurchased (in shares)			832,186	1,282,683
Amount of shares repurchased			$ 150,000	$ 211,000
Share Repurchase Program 2019
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased					500,000,000.0
Shares repurchased (in shares)			70,713
Amount of shares repurchased			$ 12,000
Stock repurchase program, remaining amount	$ 488,000		$ 488,000