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Stock-Based Compensation Plans and Employee Benefits - Activities for Unvested Stock Option Awards (Detail) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Granted | 0 | 0 | 77
Number of Options, Forfeited | (84) | (262) | (366)
Weighted Average Exercise Price, Beginning balance | $ 25.71 | $ 27.64 | $ 38.32
Weighted Average Exercise Price, Ending balance | $ 26.42 | $ 25.71 | $ 27.64
Unvested stock option awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options Outstanding, Beginning Balance | 78 |  |
Number of Options, Granted | 0 |  |
Number of Options, Vested | (58) |  |
Number of Options, Forfeited | (3) |  |
Number of Options Outstanding, Ending Balance | 17 | 78 |
Weighted Average Exercise Price, Beginning balance | $ 2.31 |  |
Weighted-Average Grant-Date Fair Value, Granted | 0 |  |
Weighted-Average Grant-Date Fair Value, Vested | 2.39 |  |
Weighted-Average Grant-Date Fair Value, Forfeited | 2.08 |  |
Weighted Average Exercise Price, Ending balance | $ 2.07 | $ 2.31 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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