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Summary of Significant Accounting Policies - Additional Information (Detail) - General Electric Company | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Percentage of accounts receivables | 18.00% |  | 18.00%
Percentage of revenues | 18.00% | 19.00% |

X
- Definition Net revenue from one of the clients as a percentage of total net revenues of the Company for the reporting period. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net amount due from one of the clients of the Company as a percentage of the total net amount due from all the clients for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References No definition available. + Details
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Period Type: | instant

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- Definition Schedule Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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Namespace Prefix: | g_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=g_GeneralElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |