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Capital Stock - Non-Vested Stock Option Activity and Related Information (Detail) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Options |  |  |
Options Outstanding Non-Vested Stock Options - beginning of year (shares) | 1,379 | 1,096 | 300
Stock options granted (in shares) | 1,052 | 732 | 916
Options, Vested (shares) | (609) | (399) | (118)
Options, Forfeited (shares) | (22) | (50) | (2)
Options Outstanding Non-Vested Stock Options - end of year (shares) | 1,800 | 1,379 | 1,096
Weighted-Average Grant Date Fair Value |  |  |
Weighted-Average Grant Date Fair Value, Outstanding non-vested stock options - beginning of Year (dollars per share) | $ 4.44 | $ 4.30 | $ 8.09
Weighted-average grant-date fair value of options granted (in dollars per share) | 4.21 | 4.71 | 3.60
Weighted-Average Grant Date Fair Value, Vested (dollars per share) | 4.65 | 4.62 | 8.48
Weighted-Average Grant Date Fair Value, Forfeited (dollars per share) | 3.93 | 3.94 | 3.60
Weighted-Average Grant Date Fair Value, outstanding non-vested stock options - end of year (dollars per share) | $ 4.25 | $ 4.44 | $ 4.30

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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 Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + 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 non-vested options outstanding. + 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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