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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Granted | 154 | 633 | 557
Number of Options, Forfeited | (731) | (784) | (472)
Weighted Average Exercise Price, Beginning balance | $ 19.16 | $ 20.29 | $ 22.48
Weighted Average Exercise Price, Ending balance | $ 17.11 | $ 19.16 | $ 20.29
Unvested stock option awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options Outstanding, Beginning Balance | 768 |  |
Number of Options, Granted | 154 |  |
Number of options, Vested | (394) |  |
Number of Options, Forfeited | (146) |  |
Number of Options Outstanding, Ending Balance | 382 | 768 |
Weighted Average Exercise Price, Beginning balance | $ 1.97 |  |
Weighted-Average Grant-Date Fair Value, Granted | 1.28 |  |
Weighted-Average Grant-Date Fair Value, Vested | 2.11 |  |
Weighted-Average Grant-Date Fair Value, Forfeited | 1.75 |  |
Weighted Average Exercise Price, Ending balance | $ 1.63 | $ 1.97 |

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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 Weighted average grant-date fair value of options vested. + References No definition available. + Details
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