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Summary of Movement in Non-Vested Share Options (Detail) (Employee Stock Option, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Employee Stock Option |  |  |
Number of Shares |  |  |
Beginning Balance | 2,094,533 |  |
Granted | 264,950 |  |
Vested | (641,773) |  |
Forfeited | (249,629) |  |
Ending Balance | 1,468,081 | 2,094,533 |
Weighted Average Exercise Price |  |  |
Beginning balance | $ 22.43 |  |
Granted | $ 33.09 |  |
Vested | $ 24.29 |  |
Forfeited | $ 22.97 |  |
Ending balance | $ 23.45 | $ 22.43 |
Weighted Average Fair Value |  |  |
Beginning Balance | $ 9.17 |  |
Granted | $ 12.05 | $ 9.59 | $ 8.20
Vested | $ 9.60 |  |
Forfeited | $ 9.46 |  |
Ending Balance | $ 9.45 | $ 9.17 |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Nonvested Options, Granted in Period Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Nonvested Options, Outstanding Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Nonvested Options, Vested in Period Weighted Average Exercise Price + References No definition available. + 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=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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