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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 1 Months Ended
Mar. 31, 2015
component
Mar. 31, 2014
Feb. 28, 2014
Dec. 31, 2014
Mar. 31, 2013
Jun. 30, 2011
Significant Accounting Policies [Line Items]            
Restricted cash $ 500,000us-gaap_RestrictedCashAndCashEquivalents     $ 400,000us-gaap_RestrictedCashAndCashEquivalents    
Unbilled revenue within accounts receivable 8,300,000us-gaap_UnbilledContractsReceivable     5,100,000us-gaap_UnbilledContractsReceivable    
Period in which revenue is billed 30 days          
Provision (benefit) for doubtful accounts 250,000us-gaap_ProvisionForDoubtfulAccounts 229,000us-gaap_ProvisionForDoubtfulAccounts        
Write-offs against the allowance for doubtful accounts 200,000us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 200,000us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs        
Property and equipment, accumulated depreciation 183,600,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment     177,800,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Software development cost capitalized 6,100,000us-gaap_CapitalizedComputerSoftwareAdditions 4,500,000us-gaap_CapitalizedComputerSoftwareAdditions        
Software development cost, amortization period (in years) 5 years          
Capitalized software depreciation expense 3,700,000us-gaap_CapitalizedComputerSoftwareAmortization 3,600,000us-gaap_CapitalizedComputerSoftwareAmortization        
Carrying value of cost method investments 1,100,000us-gaap_CostMethodInvestments     1,100,000us-gaap_CostMethodInvestments    
Number of primary components associated with collaboration solutions 5pgi_RevenueRecognitionNumberofComponents          
USF charges 6,300,000pgi_UsfFeesRevenue 6,800,000pgi_UsfFeesRevenue        
Number of shares repurchased 1,529,354us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 180,362us-gaap_StockRepurchasedAndRetiredDuringPeriodShares        
Stock repurchase program, value of shares repurchased 14,200,000us-gaap_TreasuryStockValueAcquiredCostMethod 2,100,000us-gaap_TreasuryStockValueAcquiredCostMethod        
Average price per share of stock repurchased $ 9.29us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 11.73us-gaap_TreasuryStockAcquiredAverageCostPerShare        
Shares withheld in satisfaction of employee tax withholding obligations 108,352us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 58,443us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation        
Amount remitted related to tax withholding for share-based compensation 400,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 100,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation        
Preferred stock, shares authorized 5,000,000.0us-gaap_PreferredStockSharesAuthorized          
Preferred stock, par or stated value per share $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare          
State excise and sales tax reserve 9,100,000pgi_SalesandExciseTaxPayableWithRelatedInterest     9,900,000pgi_SalesandExciseTaxPayableWithRelatedInterest    
Income tax expense 561,000us-gaap_IncomeTaxExpenseBenefit 3,297,000us-gaap_IncomeTaxExpenseBenefit        
Unrecognized tax benefits 8,300,000us-gaap_UnrecognizedTaxBenefits     8,200,000us-gaap_UnrecognizedTaxBenefits    
Unrecognized tax benefits that would affect effective tax rate, if recognized 6,800,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate     6,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Increase (decrease) in valuation allowance (100,000)us-gaap_ValuationAllowancesAndReservesAdjustments          
Investment in Cloud Solutions Provider            
Significant Accounting Policies [Line Items]            
Investment amount         1,000,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInCloudSolutionsProviderMember		  
Investment in Conferencing Company            
Significant Accounting Policies [Line Items]            
Investment accounted for under cost method investment     1,000,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember		      
Investment amount           1,000,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember
Percent of investment sold     50.00%pgi_AvailableforsaleSecuritiesSoldPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember		      
Gain on sale of investment     500,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember		      
Market value of available-for-sale investment $ 300,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember		     $ 300,000us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember		    
Minimum            
Significant Accounting Policies [Line Items]            
Contract term 12 months          
Maximum            
Significant Accounting Policies [Line Items]            
Contract term 24 months          
Furniture and Fixtures | Minimum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 5 years          
Furniture and Fixtures | Maximum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 7 years          
Software | Minimum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 2 years          
Software | Maximum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 5 years          
Computer, Communication and Network Equipment | Minimum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 3 years          
Computer, Communication and Network Equipment | Maximum            
Significant Accounting Policies [Line Items]            
Property and equipment, estimated useful life (in years) 5 years