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Segment and Related Information, Revenue By Major Customer (Details)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue, Major Customer [Line Items]    
Percentage of revenue generated by customer (in hundredths) 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Hospitality segment [Member] | McDonald's Corporation [Member] | Reportable Segments [Member]    
Revenue, Major Customer [Line Items]    
Percentage of revenue generated by customer (in hundredths) 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_McdonaldsCorporationMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_HospitalitySegmentMember		 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_McdonaldsCorporationMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_HospitalitySegmentMember
Hospitality segment [Member] | Yum! Brands, Inc. [Member] | Reportable Segments [Member]    
Revenue, Major Customer [Line Items]    
Percentage of revenue generated by customer (in hundredths) 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_YumBrandsIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_HospitalitySegmentMember		 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_YumBrandsIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_HospitalitySegmentMember
Government segment [Member] | U.S. Department of Defense [Member] | Reportable Segments [Member]    
Revenue, Major Customer [Line Items]    
Percentage of revenue generated by customer (in hundredths) 40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_UsDepartmentOfDefenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_GovernmentSegmentMember		 42.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_MajorCustomersAxis
= par_UsDepartmentOfDefenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= par_GovernmentSegmentMember
All Others [Member]    
Revenue, Major Customer [Line Items]    
Percentage of revenue generated by customer (in hundredths) 37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 33.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember