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- Details 
          
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| X | ||||||||||
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- Definition 
          Employees contribution of their pretax earnings to subsidiary plan maximum. No definition available. 
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| X | ||||||||||
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- Definition 
          Employees contribution of their pretax earnings to subsidiary plan minimum. No definition available. 
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| X | ||||||||||
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- Definition 
          Employee voluntary contributions to be matched in the form of common shares. No definition available. 
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| X | ||||||||||
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- Definition 
          Percentage of weighting to observable historical volatility for company's common stock. No definition available. 
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| X | ||||||||||
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- Definition 
          The intrinsic value of equity-based payment equity instruments, excluding stock or unit options, granted during the reporting period as calculated by applying the disclosed option pricing methodology. No definition available. 
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| X | ||||||||||
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- Definition 
          Vesting percentage of Employer contributions for each year of employment. No definition available. 
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| X | ||||||||||
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- Definition 
          Weighted average expected period for recognition of compensation expenses. No definition available. 
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| X | ||||||||||
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- Definition 
          Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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