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Income Taxes - Open Tax Years for Each Major Jurisdiction (Detail) | 9 Months Ended
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Sep. 30, 2013
United States [Member] |
Income Tax Contingency [Line Items] |
Open tax years beginning | 2002
Open tax years ending | 2012
Canada [Member] |
Income Tax Contingency [Line Items] |
Open tax years beginning | 2004
Open tax years ending | 2012
United Kingdom [Member] |
Income Tax Contingency [Line Items] |
Open tax years beginning | 2004
Open tax years ending | 2012
Netherlands [Member] |
Income Tax Contingency [Line Items] |
Open tax years beginning | 2007
Open tax years ending | 2012

X
- Definition Open tax years beginning. + References No definition available. + Details
Name: | ptgi_OpenTaxYearsBeginning
Namespace Prefix: | ptgi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Open tax years ending. + References No definition available. + Details
Name: | ptgi_OpenTaxYearsEnding
Namespace Prefix: | ptgi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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