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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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