Name:	g_MaximumEbitdaAdjustedOperatingIncomeGrowthModifiedPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_MaximumEbitdaGrowthPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	g_MaximumRevenueGrowthModifiedPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	g_MaximumRevenueGrowthPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_MinimumEbitdaAdjustedOperatingIncomeGrowthModifiedPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_MinimumRevenueGrowthModifiedPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_MinimumRevenueGrowthPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_ModifiedPerformanceTargetAdjustedIncomeFromOperationGrowthTarget
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_TargetEbitdaGrowthPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_TargetRevenueGrowthModifiedPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	g_TargetRevenueGrowthPerformanceCondition
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.