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Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2016 | Nov. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of equity [line items] |  |  |  |  |  |
Dividend payable annual percentage | 40.00% |  |  |  |  |
Dividends payable per share |  |  |  | $ 0.80 | $ 0.65 |
Treasury stock [member] |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |
Share repurchase program authorized amount |  | $ 250,000,000 |  |  |  |
Number of shares repurchase program |  |  | 2,310,492 |  |  |
Share repurchase program period value |  |  | $ 136,400,000 |  |  |
Accelerated share repurchase [member] |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |
Share repurchase program period value |  |  |  |  | $ 113,600,000 |
Class A common stock [member] |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |
Common stock, shares authorised |  |  |  | 80,000,000 |  |
Common stock, shares issued |  |  |  | 33,861,872 | 33,835,747 |
Common stock, shares outstanding |  |  |  | 31,421,265 | 31,337,856 | 31,257,686
Class B common stock [member] |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |
Common stock, shares authorised |  |  |  | 80,000,000 |  |
Common stock, shares issued |  |  |  | 10,938,125 | 10,938,125 |
Common stock, shares outstanding |  |  |  | 10,938,125 | 10,938,125 | 10,938,125
Class C common stock [member] |  |  |  |  |  |
Disclosure of equity [line items] |  |  |  |  |  |
Common stock, shares authorised |  |  |  | 80,000,000 |  |
Common stock, shares outstanding |  |  |  | 0 | 0 |

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