v2.3.0.15

Selling, General And Administrative Expenses (Schedule Of Selling, General And Administrative Expenses) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Selling, General And Administrative Expenses [Line Items]
Selling, general and administrative expenses	$ 95,868	$ 71,272	$ 250,033	$ 219,440
Personnel Expenses [Member]
Selling, General And Administrative Expenses [Line Items]
Selling, general and administrative expenses	65,684	51,263	172,642	155,206
Operational Expenses [Member]
Selling, General And Administrative Expenses [Line Items]
Selling, general and administrative expenses	27,868	17,811	71,286	56,369
Depreciation And Amortization [Member]
Selling, General And Administrative Expenses [Line Items]
Selling, general and administrative expenses	$ 2,316	$ 2,198	$ 6,105	$ 7,865

X

- Definition

Selling, General And Administrative Expenses [Line Items]

+ Details

Name:	g_SellingGeneralAndAdministrativeExpensesLineItems
Namespace Prefix:	g
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 4

-Paragraph 5A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311

+ Details

Name:	us-gaap_SellingGeneralAndAdministrativeExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration