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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury shares at beginning of period |  | 77,336,387 |  |  | 77,336,387 |
Treasury shares at end of period | 83,327,919 |  |  |  | 83,327,919 |
Treasury shares at beginning of period |  | $ 1,345,134 |  |  | $ 1,345,134 |
Treasury stock acquired, cost | $ 910 | $ 20,025 | $ 88,258 | $ 75,113 | 20,935 | $ 163,371
Treasury shares at end of period | $ 1,366,069 |  |  |  | $ 1,366,069 |
Stock Buyback Program |  |  |  |  |  |
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired, shares |  |  |  |  | 5,826,266 |
Treasury stock acquired, cost |  |  |  |  | $ 20,000 |
Long Term Incentive Plan |  |  |  |  |  |
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired, shares |  |  |  |  | 165,266 |
Treasury stock acquired, cost |  |  |  |  | $ 935 |

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