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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member]) | 9 Months Ended
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Sep. 30, 2013
Subsequent Event [Member] |
Subsequent Event [Line Items] |
Date of Plan Approval for delisting of Common Stock | Nov. 04, 2013
Effective duration from filing date for delisting of common stock | 10 days
Effective duration of termination of registration of commons stock | 90 days

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- Definition Date Of Plan Approval + References No definition available. + Details
Name: | ptgi_DateOfPlanApproval
Namespace Prefix: | ptgi_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Delisting Of Common Stock Effective Period From Filing Date + References No definition available. + Details
Name: | ptgi_DelistingOfCommonStockEffectivePeriodFromFilingDate
Namespace Prefix: | ptgi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective Period For Termination Of Registration Under Exchange Act From Filing Date + References No definition available. + Details
Name: | ptgi_EffectivePeriodForTerminationOfRegistrationUnderExchangeActFromFilingDate
Namespace Prefix: | ptgi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration