Treasury Stock - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares repurchased value	$ 50,747,000	$ 24,475,000	$ 48,244,000
Treasury stock, shares	8,162,000	7,807,000
Treasury stock, cost	$ 709,627,000	$ 658,880,000
Class A
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares repurchased	0	0	0
Treasury stock, shares repurchased value	$ 0	$ 0	$ 0
Class A | Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares repurchased program expiration date	Apr. 29, 2023
Stock authorized to repurchase by board of directors	$ 800,000,000.0
Treasury stock, shares repurchased	354,633		362,148
Shares repurchased, average price per share	$ 143.10		$ 133.21
Treasury stock, shares repurchased value	$ 50,700,000		$ 48,200,000
Treasury stock, shares	5,584,090
Shares repurchased, average price per share	$ 103.82
Treasury stock, cost	$ 579,700,000
Stock remaining available for repurchase	$ 220,300,000