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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Options Outstanding Non-Vested Stock Options - beginning of year | 202 | 389 | 723
Options, Granted | 265 | 15 | 73
Options, Vested | (167) | (188) | (401)
Options, Forfeited |  | (14) | (6)
Options Outstanding Non-Vested Stock Options - end of year | 300 | 202 | 389
Weighted-Average Grant Date Fair Value, Outstanding non-vested stock options - beginning of Year | $ 9.37 | $ 9.24 | $ 8.74
Weighted-Average Grant Date Fair Value, Granted | 7.74 | 11.50 | 10.54
Weighted-Average Grant Date Fair Value, Vested | 9.07 | 9.30 | 8.57
Weighted-Average Grant Date Fair Value, Forfeited |  | 9.01 | 9.46
Weighted-Average Grant Date Fair Value, outstanding non-vested stock options - end of year | $ 8.09 | $ 9.37 | $ 9.24

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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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