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Accounts receivable, net of reserve for doubtful receivables (Tables) | 3 Months Ended
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Mar. 31, 2016
Reserve for Doubtful Receivables | The following table provides details of the Company’s reserve for doubtful receivables:
|  | Year ended December 31, |  |  | Three months ended |
|  | 2015 |  |  | March 31, 2016 |
Opening Balance as of January 1 |  | $ | 15,192 |  |  | $ | 11,530 |
Additions charged to cost and expense |  |  | 2,449 |  |  |  | 3,120 |
Deductions/effect of exchange rate fluctuations |  |  | (6,111 | ) |  |  | 27 |
Closing Balance |  | $ | 11,530 |  |  | $ | 14,677 |

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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