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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Options |  |  |
Options Outstanding Non-Vested Stock Options - beginning of year (shares) | 300 | 202 | 389
Options, Granted (shares) | 916 | 265 | 15
Options, Vested (shares) | (118) | (167) | (188)
Options, Forfeited (shares) | (2) | 0 | (14)
Options Outstanding Non-Vested Stock Options - end of year (shares) | 1,096 | 300 | 202
Weighted-Average Grant Date Fair Value |  |  |
Weighted-Average Grant Date Fair Value, Outstanding non-vested stock options - beginning of Year (dollars per share) | $ 8.09 | $ 9.37 | $ 9.24
Weighted-Average Grant Date Fair Value, Granted (dollars per share) | 3.60 | 7.74 | 11.50
Weighted-Average Grant Date Fair Value, Vested (dollars per share) | 8.48 | 9.07 | 9.30
Weighted-Average Grant Date Fair Value, Forfeited (dollars per share) | 3.60 | 0.00 | 9.01
Weighted-Average Grant Date Fair Value, outstanding non-vested stock options - end of year (dollars per share) | $ 4.30 | $ 8.09 | $ 9.37

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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&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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