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Modification of Performance Metrics for Performance Grants Made to Former Chief Executive Officer (Detail) (Performance Grant Made to Former CEO) | 3 Months Ended
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Mar. 31, 2011
Performance Grant Made to Former CEO |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Original Performance Target, Revenue Growth, Outstanding | 20.00%
Original Performance Target, Revenue Growth, Target | 15.00%
Original Performance Target, Revenue Growth, Threshold | 10.00%
Original Performance Target, EBITDA Growth, Outstanding | 20.00%
Original Performance Target, EBITDA Growth, Target | 15.00%
Original Performance Target, EBITDA Growth, Threshold | 10.00%
Modified Performance Target, Revenue Growth, Outstanding | 17.00%
Modified Performance Target, Revenue Growth, Target | 12.50%
Modified Performance Target, Revenue Growth, Threshold | 8.00%
Modified Performance Target, Adjusted Income from Operation growth, Outstanding | 16.00%
Modified Performance Target, Adjusted Income from Operation growth, Target | 12.50%
Modified Performance Target, Adjusted Income from Operation growth, Threshold | 7.00%

X
- Definition It represents the average of three years earnings before interest, tax, depreciation and amortization (EBITDA)/Adjusted Operating Income (AOI) growth for other employees and year over year EBITDA/AOI growth for former chief executive officer to be achieved for the satisfaction of the maximum growth condition of vesting of shares against the performance awards. It specifies the modified performance condition. + References No definition available. + Details
Name: | g_MaximumEbitdaAdjustedOperatingIncomeGrowthModifiedPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years earnings before interest, tax, depreciation and amortization growth for other employees and year over year growth for former chief executive officer to be originally achieved for the satisfaction of the maximum growth condition of vesting of shares against the performance awards. + References No definition available. + Details
Name: | g_MaximumEbitdaGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the maximum growth condition for vesting of shares against the performance awards . It specifies the modified revenue growth performance condition + References No definition available. + Details
Name: | g_MaximumRevenueGrowthModifiedPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the maximum growth condition for vesting of shares against the performance awards . It specifies only the original revenue growth performance condition. + References No definition available. + Details
Name: | g_MaximumRevenueGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the average of three years earnings before interest, tax, depreciation and amortization (EBITDA)/Adjusted Operating Income (AOI) growth for other employees and year over year EBITDA/AOI growth for former chief executive officer to be achieved for the satisfaction of the threshold growth condition of vesting of shares against the performance awards. It specifies the modified performance condition. + References No definition available. + Details
Name: | g_MinimumEbitdaAdjustedOperatingIncomeGrowthModifiedPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the minimum growth condition for vesting of shares against the performance awards . It specifies the modified revenue growth performance condition. + References No definition available. + Details
Name: | g_MinimumRevenueGrowthModifiedPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the minimum growth condition for vesting of shares against the performance awards . It specifies only the original revenue growth performance condition. + References No definition available. + Details
Name: | g_MinimumRevenueGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the average of three years earnings before interest, tax, depreciation and amortization (EBITDA)/Adjusted Operating Income (AOI) growth for other employees and year over year EBITDA/AOI growth for former chief executive officer to be achieved for the satisfaction of the target growth condition of vesting of shares against the performance awards. It specifies the modified performance condition. + References No definition available. + Details
Name: | g_ModifiedPerformanceTargetAdjustedIncomeFromOperationGrowthTarget
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years earning before interest, tax, depreciation and amortization growth for other employees and year over year growth for former chief executive officer to be originally achieved for the satisfaction of the target growth condition of vesting of shares against the performance awards. + References No definition available. + Details
Name: | g_TargetEbitdaGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the target growth condition for vesting of shares against the performance awards . It specifies the modified revenue growth performance condition. + References No definition available. + Details
Name: | g_TargetRevenueGrowthModifiedPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years average revenue growth for other employees and year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the target growth condition for vesting of shares against the performance awards . It specifies only the original revenue growth performance condition. + References No definition available. + Details
Name: | g_TargetRevenueGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents three years earning before interest, tax, depreciation and amortization growth for other employees and year over year growth for former chief executive officer to be originally achieved for the satisfaction of the minimum growth condition of vesting of shares against the performance awards. + References No definition available. + Details
Name: | g_ThresholdEbitdaGrowthPerformanceCondition
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
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