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Assumptions Used to Estimate Fair Value of Stock Options Granted (Detail) | 12 Months Ended
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Dec. 31, 2016 ExecutiveOfficers | [1] | Dec. 31, 2015 Employee ExecutiveOfficers | Dec. 31, 2014 Employee ExecutiveOfficers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, Minimum | 38.00% | 33.00% | 33.00%
Expected volatility, Maximum | 49.00% | 49.00% | 52.00%
Risk-free interest rate, Minimum | 0.50% | 0.20% | 0.10%
Risk-free interest rate, Maximum | 2.40% | 2.40% | 2.50%
Expected forfeiture (employees) |  | 10.00% | 10.00%
Expected forfeiture (executives) | 5.00% | 5.00% | 5.00%
Contractual term of up to | 10 years | 10 years | 10 years
Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Suboptimal exercise multiple | Employee |  | 2.1 | 2.1
Executives |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Suboptimal exercise multiple | ExecutiveOfficers | 2.4 | 2.4 | 2.4
[1] | During 2016, the Company did not grant stock options nor SARs to its employees.

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- Definition Share based compensation arrangement by share based payment award fair value assumptions, expected forfeiture. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture for executives. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Suboptimal Exercise Factor + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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