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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021
Schedule of Treasury Stock [Line Items] |  |  |  |
Treasury shares at beginning of period |  |  |  | 83,402,322
Treasury shares at end of period | 83,830,987 |  |  | 83,830,987
Treasury shares at beginning of period |  |  |  | $ 1,366,313
Acquisitions pursuant to long-term incentive plan, cost | $ 3,522 | $ 910 | $ 20,025 |
Treasury shares at end of period | $ 1,369,835 |  |  | $ 1,369,835
Long Term Incentive Plan |  |  |  |
Schedule of Treasury Stock [Line Items] |  |  |  |
Acquisitions pursuant to long-term incentive plan, shares |  |  |  | 428,665
Acquisitions pursuant to long-term incentive plan, cost |  |  |  | $ 3,522

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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=120391452&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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