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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Commitments And Contingencies Disclosure [Abstract] |  |
Purchase commitments | $ 2.5 | $ 7.2

X
- Definition Payments for purchase commitment. + References No definition available. + Details
Name: | ptgi_PaymentsForPurchaseCommitment
Namespace Prefix: | ptgi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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