v2.3.0.15

Stock Based Compensation (Schedule Of Performance Grants) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees affected	45
Incremental compensation cost	$ 4,109
Weighted average period of recognizing incremental compensation cost (in months)	21.5
Year 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost	2,878
Year 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost	$ 1,231
Performance Grants Made To Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Original Performance Target, Revenue Growth, Outstanding	20.00%
Original Performance Target, EBITDA Growth, Outstanding	20.00%
Original Performance Target, Revenue Growth, Threshold	10.00%
Original Performance Target, EBITDA Growth, Threshold	10.00%
Original Performance Target, Revenue Growth, Target	15.00%
Original Performance Target, EBITDA Growth, Target	15.00%
Modified Performance Target, Revenue Growth, Outstanding	20.00%
Modified Performance Target, Adjusted Income from Operation growth, Outstanding	20.00%
Modified Performance Target, Revenue Growth, Threshold	10.00%
Modified Performance Target, Adjusted Income from Operation growth, Threshold	10.00%
Modified Performance Target, Revenue Growth, Target	15.00%
Modified Performance Target, Adjusted Income from Operation growth, Target	15.00%
Performance Grant Made To The Former Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Original Performance Target, Revenue Growth, Outstanding	20.00%
Original Performance Target, EBITDA Growth, Outstanding	20.00%
Original Performance Target, Revenue Growth, Threshold	10.00%
Original Performance Target, EBITDA Growth, Threshold	10.00%
Original Performance Target, Revenue Growth, Target	15.00%
Original Performance Target, EBITDA Growth, Target	15.00%
Modified Performance Target, Revenue Growth, Outstanding	17.00%
Modified Performance Target, Adjusted Income from Operation growth, Outstanding	16.00%
Modified Performance Target, Revenue Growth, Threshold	8.00%
Modified Performance Target, Adjusted Income from Operation growth, Threshold	7.00%
Modified Performance Target, Revenue Growth, Target	12.50%
Modified Performance Target, Adjusted Income from Operation growth, Target	12.50%

X

- Definition

Represents the year over year adjusted income from operations growth for the former chief executive officer to be achieved for the satisfaction of the maximum growth as per the modified condition of the performance awards.

+ Details

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- Definition

Represents the average EBITDA/adjusted income from operations growth for other employees to be achieved for the satisfaction of the maximum growth as per the modified condition of the performance awards.

+ Details

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- 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.

+ Details

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- Definition

It represents year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the maximum condition for vesting of shares against the performance awards. It specifies modified revenue growth performance condition.

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X

- Definition

It represents three years average revenue growth for other employees to be achieved for the satisfaction of the maximum condition for vesting of shares against the performance awards. It specifies the modified revenue growth performance condition.

+ Details

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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.

+ Details

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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.

+ Details

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X

- Definition

Represents the year over year adjusted income from operations growth for the former chief executive officer to be achieved for the satisfaction of the target growth as per the modified condition of the performance awards.

+ Details

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X

- Definition

Represents the average EBITDA/adjusted income from operations growth for other employees to be achieved for the satisfaction of the target growth as per the modified condition of the performance awards.

+ Details

Name:	g_TargetAdjustedIncomeFromOperationGrowthPerformanceConditionOtherEmployees
Namespace Prefix:	g
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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.

+ Details

Name:	g_TargetEbitdaGrowthPerformanceCondition
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X

- Definition

It represents year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the target condition for vesting of shares against the performance awards. It specifies modified revenue growth performance condition.

+ Details

Name:	g_TargetRevenueGrowthModifiedPerformanceConditionFormerChiefExecutiveOfficer
Namespace Prefix:	g
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Balance Type:	na
Period Type:	duration

X

- Definition

It represents three years average revenue growth for other employees to be achieved for the satisfaction of the target condition for vesting of shares against the performance awards. It specifies the modified revenue growth performance condition.

+ Details

Name:	g_TargetRevenueGrowthModifiedPerformanceConditionOtherEmployees
Namespace Prefix:	g
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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.

+ Details

Name:	g_TargetRevenueGrowthPerformanceCondition
Namespace Prefix:	g
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X

- Definition

Represents the year over year adjusted income from operations growth for the former chief executive officer to be achieved for the satisfaction of the minimum growth as per the modified condition of the performance awards.

+ Details

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X

- Definition

Represents the average EBITDA/adjusted income from operations growth for other employees to be achieved for the satisfaction of the minimum growth as per the modified condition of the performance awards.

+ Details

Name:	g_ThresholdAdjustedIncomeFromOperationGrowthPerformanceConditionOtherEmployees
Namespace Prefix:	g
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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.

+ Details

Name:	g_ThresholdEbitdaGrowthPerformanceCondition
Namespace Prefix:	g
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Period Type:	duration

X

- Definition

It represents year over year revenue growth for former chief executive officer to be achieved for the satisfaction of the minimum condition for vesting of shares against the performance awards. It specifies modified revenue growth performance condition.

+ Details

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X

- Definition

It represents three years average revenue growth for other employees to be achieved for the satisfaction of the minimum condition for vesting of shares against the performance awards. It specifies the modified revenue growth performance condition.

+ Details

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Namespace Prefix:	g
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X

- Definition

It represents the period over which the incremental compensation cost arising as a result of the modification is to be recognized.

+ Details

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X

- 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.

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X

- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of employees affected by the modification of an equity-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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