v2.4.1.9

Significant Agreements Litigation Settlement (Details) (Past Infringement [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013
Litigation Settlement, Amount | $ 36.4 us-gaap_LitigationSettlementAmount |  |  |
Pegatron [Member] |  |  |  |
Litigation Settlement, Amount |  | 23.5 us-gaap_LitigationSettlementAmount / us-gaap_MajorCustomersAxis = idcc_PegatronMember / idcc_RoyaltyRevenueAxis = idcc_PastInfringementMember | 71.4 us-gaap_LitigationSettlementAmount / us-gaap_MajorCustomersAxis = idcc_PegatronMember / idcc_RoyaltyRevenueAxis = idcc_PastInfringementMember |
Technology Solutions Customer [Member] |  |  |  |
Litigation Settlement, Amount |  |  | $ 53.3 us-gaap_LitigationSettlementAmount / us-gaap_MajorCustomersAxis = idcc_TechnologySolutionsCustomerMember / idcc_RoyaltyRevenueAxis = idcc_PastInfringementMember | $ 51.6 us-gaap_LitigationSettlementAmount / us-gaap_MajorCustomersAxis = idcc_TechnologySolutionsCustomerMember / idcc_RoyaltyRevenueAxis = idcc_PastInfringementMember

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration