Stockholders' Equity - Additional Information (Details)		12 Months Ended
	Nov. 01, 2019 USD ($) $ / shares	Dec. 31, 2020 USD ($) Vote / shares Directors $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Jan. 31, 2018 USD ($)	Dec. 31, 2017 shares
Schedule Of Capitalization Equity [Line Items]
Preferred stock, shares authorized		100,000,000	100,000,000
Preferred stock, par value | $ / shares		$ 0.001	$ 0.001
Preferred stock, shares issued		0	0
Common stock, shares authorized		1,600,000,000	1,600,000,000
Common stock, par value | $ / shares		$ 0.001	$ 0.001
Percentage of directors elected by common stock holders		25.00%
Number of directors | Directors		3
Conversion of Class B common stock		100.00%
Common stock, shares issued		140,775,221	138,698,307
Common stock, shares outstanding		121,930,607	124,581,773
Repurchase of shares of common stock authorized | $	$ 100,000,000
Repurchase of common stock, shares		4,707,450	2,059,846	2,582,198
Average price of shares repurchased, common stock | $ / shares		$ 24.32	$ 29.32	$ 38.73
Aggregate cost of shares repurchased, common stock | $		$ 115,000,000	$ 60,000,000	$ 100,000,000
Remaining authorized share repurchased amount | $	$ 250,000,000	$ 75,000,000	$ 190,000,000	$ 150,000,000
Treasury stock, shares		18,844,614	14,116,534	12,056,688
Aggregate cost of treasury stock | $		$ 722,000,000	$ 607,000,000	$ 547,000,000
Dividend declared | $ / shares	$ 3.50	$ 0	$ 3.50	$ 0
Estimated aggregate cash dividend declared | $	$ 488,000,000
Dividend payable date	Dec. 04, 2019
Dividend record date	Nov. 20, 2019
Maximum
Schedule Of Capitalization Equity [Line Items]
Repurchase of shares of common stock authorized | $					$ 250,000,000
Class B Common Stock
Schedule Of Capitalization Equity [Line Items]
Common stock, shares authorized		400,000,000	400,000,000
Common stock, par value | $ / shares		$ 0.001	$ 0.001
Right to voting		10 votes per share
Vote per common stock share | Vote / shares		10
Common stock, shares issued		12,799,999	12,799,999
Common stock, shares outstanding		12,799,999	12,799,999	12,799,999		12,799,999
Common Stock
Schedule Of Capitalization Equity [Line Items]
Common stock, shares authorized		1,600,000,000
Common stock, par value | $ / shares		$ 0.001
Right to voting		one vote per share
Vote per common stock share | Vote / shares		1
Common stock, shares outstanding		140,775,221	138,698,307	137,158,010		135,617,263