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Accounts Receivable, Net of Reserve for Doubtful Receivables (Tables) | 9 Months Ended
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Sep. 30, 2013
Reserve for Doubtful Receivables | The following table provides details of the reserve for doubtful receivables recorded by the Company:
|  | As of December 31, 2012 |  |  | As of September 30, 2013 |
Opening balance as of January 1 |  | $ | 8,704 |  |  | $ | 9,073 |
Additions due to acquisitions |  |  | 184 |  |  |  | — |
Additions charged to cost and expense |  |  | 3,878 |  |  |  | 8,919 |
Deductions |  |  | (3,693 | ) |  |  | (3,473 | )
Closing balance |  | $ | 9,073 |  |  | $ | 14,519 |

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- Definition It discloses the balance of reserve for doubtful receivables at the beginning of the reporting period, further reserve created/reversed and balance of reserve for doubtful receivables at the end of the reporting period. + References No definition available. + Details
Name: | g_ScheduleOfReserveForDoubtfulReceivablesTableTextBlock
Namespace Prefix: | g_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration