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Short-Term Borrowings - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Mar. 23, 2015 | Jan. 27, 2015 | Aug. 30, 2012
Line of Credit Facility [Line Items] |  |  |  |  |  |
Fund-based and non-fund-based credit facilities limits available | $ 15,502 |  | $ 15,781 |  |  |
Utilization of credit facility for non fund-based usage | 10,630 |  | 10,301 |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 925,000
Credit facility, amount utilized | $ 82,947 |  | $ 22,947 |  |  |
Margin over LIBOR | 1.50% | 1.50% | 1.50% |  |  |
Percentage of commitment fee | 0.25% |  | 0.25% |  |  |
Revolving credit facility, expiration month and year | 2020-06 |  |  |  |  |
Line of credit covenant condition | The credit agreement contains certain customary covenants, including a maximum leverage covenant and a minimum interest coverage ratio. |  |  |  |  |
Short term loans | $ 81,500 |  | $ 21,500 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility, maximum borrowing capacity | 350,000 |  |  |  |  | $ 250,000
Fund-Based Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility, amount utilized | $ 81,500 |  | $ 21,500 |  |  |
Margin over LIBOR | 1.50% |  | 1.50% |  |  |
Non-Fund-Based Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility, amount utilized | $ 1,447 |  | $ 1,447 |  |  |
Morgan Stanley Senior Funding, Inc |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short term loans |  |  |  | $ 737,500 | $ 672,500 |
Short term borrowings fixed interest rate | 2.00% |  |  |  |  |
Debt issuance cost | $ 1,045 |  |  |  |  |
Interest expense | $ 235 |  |  |  |  |

X
- 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

X
- 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

X
- Definition Utilized amount of borrowed credit facility as of the balance sheet date. + References No definition available. + Details
Name: | g_LineOfCreditFacilityAmountUtilized
Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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: | duration

X
- 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

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

X
- 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
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Namespace Prefix: | g_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- 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. + References No definition available. + Details
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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 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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Balance Type: | credit
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- Definition The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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