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Stock-Based Compensation (Detail) - (Table 1) - $ / shares |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | May 24, 2019
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |
Common stock authorized |  |  |  |  |  |  |  | 11,000,000
Stock-based awards, including restricted stock and stock options granted, net of expired or cancelled |  |  |  | (3,269,478) |  |  |  |
Common stock available for grant of stock-based awards as of June 30, 2012 |  | 7,730,522 |  | 7,730,522 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 225,000 |  |  | 254,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  | 2,951,891 |  | 2,951,891 |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period |  | 63,980 | 65,390 | 485,516 | 575,552 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share) |  | $ 41.50 | $ 24.86 | $ 27.73 | $ 26.83 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 3,608,000 | 4,468,000 | 3,608,000 | 4,468,000 | 3,651,000 | 4,427,000 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number |  | 514,800 |  | 514,800 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 2,560,543 |  | 2,560,543 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  |  | 1,856,250 |  |  |  |
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number |  | 168,750 |  | 168,750 |  |  |  |

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- Definition The weighted-average price as of balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan that vested during the reporting period. + References No definition available. + Details
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