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Income Per Share and Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2020	Feb. 28, 2019	Jan. 31, 2019	Oct. 31, 2016	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 30, 2019	Aug. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, shares					0	0
Shares repurchased during the period, value							$ 49,000,000	$ 50,028,000	$ 94,088,000
Capacity remaining under current stock repurchase program					$ 350,000,000.0			350,000,000.0
Exchange Act (10b5-1 Plan) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, value			$ 45,100,000
Exchange Act (10b5-1 Plan) [Member] | March 2019 Program [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, value										$ 100,000,000.0
Class A Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount					$ 500,000,000.0			500,000,000.0
Authorized share repurchase term		3 years		3 years
Shares repurchased during the period, value								$ 11,000	$ 11,000
Authorized share additional repurchase amount											$ 100,000,000.0	$ 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		$ 300,000,000.0		$ 250,000,000.0
Class A Common Stock [Member] | Exchange Act (10b5-1 Plan) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, shares	1,050,084		1,144,449
Shares repurchased during the period, value	$ 50,000,000.0
Average price per share	$ 47.62		$ 39.38
Class A Common Stock [Member] | Exchange Act (10b5-1 Plan) [Member] | March 2019 Program [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares repurchased during the period, shares										1,936,458
Average price per share										$ 51.64
Contingently Issuable Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computation of diluted income per share					1,294,385		320,154	1,191,464	447,687

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