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Summary of Significant Accounting Policies - Additional Information (Detail) (General Electric Company) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
General Electric Company |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of accounts receivables | 27.00% |  | 27.00% |  | 30.00%
Percentage of revenues | 22.00% | 26.00% | 23.00% | 26.00% |

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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Namespace Prefix: | g_
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
Name: | g_PercentageOfAccountsReceivables
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | g_ScheduleOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | g_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration