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Obligations (Details) (USD $)
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12 Months Ended | ||||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Apr. 04, 2011
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| Debt Instrument [Line Items] | |||||
| Amortization of Financing Costs | $ 1,303,000us-gaap_AmortizationOfFinancingCosts | $ 1,303,000us-gaap_AmortizationOfFinancingCosts | $ 1,303,000us-gaap_AmortizationOfFinancingCosts | ||
| Senior Notes | 230,000,000us-gaap_SeniorNotes | 230,000,000us-gaap_SeniorNotes | 230,000,000us-gaap_SeniorNotes | ||
| Debt Instrument, Unamortized Discount | (12,165,000)us-gaap_DebtInstrumentUnamortizedDiscount | (21,187,000)us-gaap_DebtInstrumentUnamortizedDiscount | |||
| Long-term Debt | 217,835,000us-gaap_LongTermDebt | 208,813,000us-gaap_LongTermDebt | |||
| Long-term Debt, Current Maturities | 0us-gaap_DebtCurrent | 0us-gaap_DebtCurrent | |||
| Long-term debt obligations | 217,835,000us-gaap_LongTermDebtNoncurrent | 208,813,000us-gaap_LongTermDebtNoncurrent | |||
| Land and Building Carrying Amount | 12,546,000us-gaap_PropertyPlantAndEquipmentNet | 9,535,000us-gaap_PropertyPlantAndEquipmentNet | |||
| Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths | ||||
| 2013 - Long Term Debt Maturities | 230,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo | ||||
| 2014 - Long Term Debt Maturities | 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree | ||||
| 2015 - Long Term Debt Maturities | 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour | ||||
| 2016 - Long Term Debt Maturities | 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive | ||||
| Thereafter - Long Term Debt Maturities | 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive | ||||
| Total debt obligations | 230,000,000us-gaap_DebtInstrumentCarryingAmount | ||||
| Balance Sheet by Location [Domain] | Convertible Debt [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Payments of Debt Issuance Costs | $ 8,000,000us-gaap_PaymentsOfDebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = idcc_BalanceSheetByLocationDomain / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
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| X | ||||||||||
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- Definition
Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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