Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 31, 2018
Schedule Of Capitalization Equity [Line Items]
Repurchase of common stock, shares	0	2,329,548	0	2,582,198
Aggregate cost of shares repurchased, common stock		$ 90,000,000		$ 100,000,000
Average price of shares repurchased, common stock		$ 38.60		$ 38.73
Remaining authorized share repurchased amount	$ 150,000,000		$ 150,000,000
Treasury stock, shares	12,056,688		12,056,688		12,056,688
Aggregate cost of treasury stock	$ 547,000,000		$ 547,000,000		$ 547,000,000
Maximum
Schedule Of Capitalization Equity [Line Items]
Repurchase of shares of common stock authorized						$ 250,000,000