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Income Per Share and Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended		2 Months Ended	3 Months Ended		9 Months Ended
	Mar. 11, 2019	Jan. 31, 2019	Oct. 31, 2016	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 31, 2019	Feb. 28, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, shares				3,980,656
Shares repurchased during the period, value				$ 161,000,000.0	$ 49,000,000		$ 94,088,000
Payments for repurchase of additional shares							94,088,000
Class A Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount									$ 400,000,000.0
Authorized share repurchase term	3 years		3 years
Shares repurchased during the period, value							$ 11,000
Average price per share		$ 39.38		$ 40.43	$ 52.50
Payments for repurchase of additional shares		$ 45,100,000			$ 49,000,000.0
Shares repurchased during the period		1,144,449			932,973
Authorized share additional repurchase amount									$ 100,000,000.0
Class A Common Stock [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount			$ 250,000,000.0							$ 300,000,000.0
Contingently Issuable Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computation of diluted income per share					320,154	34,470	447,687	28,922

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