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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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