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Capital Stock - Non-Vested Stock Option Activity and Related Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Options Outstanding Non-Vested Stock Options-beginning of year | 723 | 1,057 | 2,160
Options, Granted | 73 | 433 | 96
Options, Vested | (401) | (747) | (1,071)
Options, Forfeited | (6) | (20) | (128)
Options Outstanding Non-Vested Stock Options-end of year | 389 | 723 | 1,057
Weighted-Average Grant Date Fair Value, Outstanding non-vested stock options-beginning of Year | $ 8.74 | $ 6.40 | $ 6.36
Weighted-Average Grant Date Fair Value, Granted | $ 10.54 | $ 8.72 | $ 11.27
Weighted-Average Grant Date Fair Value, Vested | $ 8.57 | $ 5.44 | $ 6.18
Weighted-Average Grant Date Fair Value, Forfeited | $ 9.46 | $ 8.24 | $ 11.47
Weighted-Average Grant Date Fair Value, outstanding non-vested stock options-end of year | $ 9.24 | $ 8.74 | $ 6.40

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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 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 Number of options vested. + References No definition available. + Details
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