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Short-Term Borrowing - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended |  |  | 6 Months Ended |  |  | 9 Months Ended |  |  |  | 6 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Aug. 30, 2012 | May 31, 2011 | Jun. 30, 2013 Revolving Credit Facility | Aug. 30, 2012 Revolving Credit Facility | May 31, 2011 Revolving Credit Facility | Sep. 30, 2013 Fund-Based Credit Facility | Dec. 31, 2012 Fund-Based Credit Facility | Sep. 30, 2013 Non-Fund-Based Credit Facility | Dec. 31, 2012 Non-Fund-Based Credit Facility | Jun. 30, 2013 Original Margin | Sep. 30, 2013 Original Margin
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fund-based and non-fund-based credit facilities limits available | $ 16,393 | $ 18,489 |  |  |  |  |  |  |  |  |  |  |
Utilization of credit facility for non fund-based usage | 6,686 | 5,942 |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | 925,000 | 380,000 |  | 250,000 | 260,000 |  |  |  |  |  |
Credit facility, amount utilized | $ 87,439 | $ 4,397 |  |  |  |  |  | $ 80,000 | $ 0 | $ 7,439 | $ 4,397 |  |
Margin over LIBOR | 2.75% | 3.25% |  |  | 2.50% |  |  | 2.50% |  |  |  | 3.25% | 3.25%
Percentage of commitment fee | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, expiration month and year | 2017-08 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit covenant condition | Indebtedness under these facilities is secured by certain assets and the credit agreement contains certain covenants, including a maximum leverage covenant that becomes effective only if the revolving facility is drawn for $50,000 or more. |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Limit available for fund based and non fund based credit facilities with banks for short term in the form of overdraft, letter of credit, guarantees, short term loans excluding forward hedging. + References No definition available. + Details
Name: | g_FundBasedNonFundBasedCreditFacilityLimit
Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition It states the credit covenant condition on the revolving facility. + References No definition available. + Details
Name: | g_LineOfCreditCovenantCondition
Namespace Prefix: | g_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents the month and year in which the credit facility will expire. + References No definition available. + Details
Name: | g_LineOfCreditFacilityMaturityMonthAndYear
Namespace Prefix: | g_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the margin to be added to LIBOR to arrive at the interest rate to be paid on the credit facility. + References No definition available. + Details
Name: | g_MarginOverLiborForInterestRateOnLineOfCredit
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents the fee, expressed as a percentage of the unutilized amount of the line of credit facility. + References No definition available. + Details
Name: | g_UnutilizedAmountOfLineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the utilization of credit facility for non-fund based usage for short term in the form of overdraft, letter of credit, guarantees, short term loans excluding forward hedging. + References No definition available. + Details
Name: | g_UtilizationOfCreditFacilityForNonFundBasedUsage
Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant