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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended			12 Months Ended
	Feb. 28, 2019	Jan. 31, 2019	Oct. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2019	Aug. 31, 2019
Equity [Line Items]
Preferred stock shares				25,000,000
Shares repurchased during the period, shares				3,080,907	3,980,656
Shares repurchased during the period, value				$ 145,137,000	$ 161,034,000
Capacity remaining under current stock repurchase program				400,000,000.0
October 2016 Program [Member]
Equity [Line Items]
Shares repurchased during the period, value		$ 45,100,000
March 2019 Program [Member]
Equity [Line Items]
Shares repurchased during the period, value				100,000,000.0
Class A Common Stock [Member]
Equity [Line Items]
Authorized share repurchase amount				500,000,000.0
Authorized share repurchase term	3 years		3 years
Shares repurchased during the period, shares					3,980,656	0	0
Shares repurchased during the period, value				$ 31,000	$ 40,000
Average price per share					$ 40.43
Authorized share additional repurchase amount								$ 100,000,000.0	$ 100,000,000.0
Class A Common Stock [Member] | Maximum [Member]
Equity [Line Items]
Authorized share repurchase amount	$ 300,000,000.0		$ 250,000,000.0
Class A Common Stock [Member] | October 2016 Program [Member]
Equity [Line Items]
Shares repurchased during the period, shares		1,144,449
Average price per share		$ 39.38
Class A Common Stock [Member] | March 2019 Program [Member]
Equity [Line Items]
Shares repurchased during the period, shares				1,936,458
Average price per share				$ 51.64

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