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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury shares at beginning of period |  |  | 53,701,096 |  |  |  | 53,701,096 |
Other |  |  |  |  |  |  | 31,013 |
Treasury shares at end of period | 74,709,070 |  |  |  |  |  | 74,709,070 |
Treasury shares at beginning of period |  |  | $ 1,080,448 |  |  |  | $ 1,080,448 |
Treasury stock acquired, cost | $ 76,123 | $ 88,258 | $ 75,113 | $ 51,776 | $ 42,951 | $ 16,928 | 239,494 | $ 111,655
Other |  |  |  |  |  |  | 371 |
Treasury shares at end of period | $ 1,319,942 |  |  |  |  |  | $ 1,319,942 |
Stock Buyback Program |  |  |  |  |  |  |  |
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired, shares |  |  |  |  |  |  | 19,961,344 |
Treasury stock acquired, cost |  |  |  |  |  |  | $ 225,109 |
Long Term Incentive Plan |  |  |  |  |  |  |  |
Schedule of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired, shares |  |  |  |  |  |  | 1,015,617 |
Treasury stock acquired, cost |  |  |  |  |  |  | $ 14,014 |

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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