Common Stock - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2019	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid, per share	$ 0.20	$ 0.20		$ 0.60	$ 0.40
Stock repurchase programs authorized to purchase, value			$ 2,700,000,000			$ 1,000,000,000.0	$ 1,700,000,000
Stock repurchased, value			206,719,000	$ 753,927,000	$ 414,002,000
Compensation cost recognized			$ 65,837,000	69,431,000	66,581,000
Restricted stock units granted			2,589,966
Forfeitures utilization term			5 years
Total in-the-money value of all stock options exercised during the year			$ 22,200,000	$ 126,700,000	39,900,000
Granted, Weighted Average Grant Date Fair Value			$ 14.60
Weighted average grant-date fair value of restricted stock units			$ 22.74	$ 28.45
Granted, Shares			2,589,966
ASU 2016-09 | Revision of Prior Period, Accounting Standards Update, Adjustment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New accounting adoption impact on income taxes and net income			$ 7,400,000	$ 12,200,000	1,200,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost recognized, pre-tax charge			54,700,000	60,100,000	61,100,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost recognized, after-tax			11,200,000	$ 9,300,000	$ 5,500,000
Unrecognized compensation cost			$ 97,800,000
Unrecognized compensation cost vesting period			2 years 3 months 18 days
Unvested Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 97,800,000
Unrecognized compensation cost vesting period			2 years 3 months 18 days
Income Tax Withholding Obligations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares			81,057	336,943	102,800
Stock repurchased, value			$ 10,200,000	$ 47,700,000	$ 12,700,000
Stock Repurchase Programs Twenty Twenty
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares			1,951,899
Stock repurchased, value			$ 196,600,000
Stock Repurchase Programs Twenty Nineteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased, shares				5,397,753
Stock repurchased, value				$ 706,200,000
Total number of shares cancelled			17,779
Stock Repurchase Programs Twenty Eighteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value				$ 1,000,000,000
Stock repurchased, shares					3,321,968
Stock repurchased, value					$ 401,300,000
Total number of shares cancelled				27,713
Stock Repurchase Programs Twenty Seventeen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value					$ 500,000,000
Total number of shares cancelled					11,224
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of option granted, number of shares			2,500,000	2,200,000	2,100,000
Additional stock options granted			0
2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of option granted, number of shares			44,000
Total number of shares cancelled			0
2020 Stock Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted			3,000
Weighted average grant-date fair value of restricted stock units			$ 109.72
Granted, Shares			3,000
2010 Employees' Restricted Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock options granted			0
2010 Employees' Restricted Stock Purchase Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted			119,844	117,467	136,571
Granted, Weighted Average Grant Date Fair Value			$ 68.06	$ 133.98	$ 119.51
Granted, Shares			119,844	117,467	136,571
2010 Employees' Restricted Stock Purchase Plan | Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period			5 years	5 years	5 years
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of option granted, number of shares			14,600,000	30,400,000	28,190,000
Options are exercisable, in period			4 years
Employee Stock Purchase Plan Twenty Zero Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted			115,008	82,449	87,051
Common Stock remain available for issuance			500,000
Granted, Shares			115,008	82,449	87,051
Stock issued during period, net of cancellations			1,500,000
Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase programs authorized to purchase, value			$ 559,600,000
Stock repurchased, value			$ 20,000	$ 57,000	$ 34,000
Common Stock, shares issued			77,805,530	79,449,349
Issuance upon conversion of shares			22,087,459
Class B | Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved			35,600,000
Class B | 2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, shares issued			6,100,000
Common Stock remain available for issuance			6,000,000.0
Class B | 2010 Employees' Restricted Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved			600,000
Class B | Employee Stock Purchase Plan Twenty Zero Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved			2,000,000.0
Special Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared and paid	$ 17,300,000			$ 53,000,000.0	$ 37,300,000