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EQUITY AND OTHER INVESTMENTS - Additional Information (Details) (USD $)
12 Months Ended 0 Months Ended 10 Months Ended 1 Months Ended 2 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Aug. 05, 2013
acre
Nov. 30, 2014
Nov. 30, 2014
Jan. 27, 2015
Schedule of Equity Method Investments [Line Items]              
Equity in net income from equity investments $ 8,916,000us-gaap_IncomeLossFromEquityMethodInvestments $ 9,434,000us-gaap_IncomeLossFromEquityMethodInvestments $ 2,757,000us-gaap_IncomeLossFromEquityMethodInvestments        
Distribution in excess of profits 10,076,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 8,216,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions        
Expected incremental cash flow over the next several years when combined with the net proceeds and cash tax benefit 118,000,000isca_ExpectedIncrementalCashFlowFromNetProceedsandCashTaxBenefitfromSaleofProperty       118,000,000isca_ExpectedIncrementalCashFlowFromNetProceedsandCashTaxBenefitfromSaleofProperty 118,000,000isca_ExpectedIncrementalCashFlowFromNetProceedsandCashTaxBenefitfromSaleofProperty  
Equity investments 122,565,000us-gaap_EquityMethodInvestments 134,327,000us-gaap_EquityMethodInvestments     122,565,000us-gaap_EquityMethodInvestments 122,565,000us-gaap_EquityMethodInvestments  
Income taxes 33,233,000us-gaap_IncomeTaxExpenseBenefit 27,784,000us-gaap_IncomeTaxExpenseBenefit 31,653,000us-gaap_IncomeTaxExpenseBenefit        
380 Development              
Schedule of Equity Method Investments [Line Items]              
Number of acres purchased in the New York City borough of Staten Island       676isca_NumberOfLandParcelsAcquired
/ dei_LegalEntityAxis
= isca_Subsidiary380DevelopmentLLCMember
     
Kansas Entertainment              
Schedule of Equity Method Investments [Line Items]              
Ownership interest in joint venture 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
    50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
 
Equity in net income from equity investments 8,900,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
9,400,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
2,800,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
       
Kansas Entertainment Limited Liability Company              
Schedule of Equity Method Investments [Line Items]              
Proceeds from Income Tax Refunds   1,100,000us-gaap_ProceedsFromIncomeTaxRefunds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
         
Gross revenue expense ratio         100.00%isca_GrossRevenueExpenseRatio
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
   
Income from equity method investments, related penalty amount 600,000isca_IncomeLossfromEquityMethodInvestmentsRelatedPenaltyAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
           
Subsidiary 380 Development Limited Liability Company              
Schedule of Equity Method Investments [Line Items]              
Ownership interest in joint venture       100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
     
Distribution in excess of profits 6,100,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
    7,500,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
     
Carrying amount of investment sold       80,000,000us-gaap_EquityMethodInvestmentSoldCarryingAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
     
Option received       4,200,000isca_EquityMethodInvestmentOptionReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
     
Debt, interest rate       7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
     
Future proceeds of purchase price 66,400,000isca_AnticipatedFutureProceedsfromEquityMethodInvestmentDividendsorDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
      66,400,000isca_AnticipatedFutureProceedsfromEquityMethodInvestmentDividendsorDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
66,400,000isca_AnticipatedFutureProceedsfromEquityMethodInvestmentDividendsorDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
 
Deferred profit 1,900,000isca_EquityMethodInvestmentProfitDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
      1,900,000isca_EquityMethodInvestmentProfitDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
1,900,000isca_EquityMethodInvestmentProfitDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
 
Accrued interest on deferred profit 5,600,000isca_EquityMethodInvestmentAccruedInterestDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
      5,600,000isca_EquityMethodInvestmentAccruedInterestDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
5,600,000isca_EquityMethodInvestmentAccruedInterestDeferred
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_SubsidiaryThreeEightyDevelopmentLimitedLiabilityCompanyMember
 
Motorsports Authentics              
Schedule of Equity Method Investments [Line Items]              
Ownership interest in joint venture 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLLCMember
  100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLLCMember
  50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLLCMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLLCMember
 
Motorsports Authentics Limited Liability Company              
Schedule of Equity Method Investments [Line Items]              
Equity investments 5,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLimitedLiabilityCompanyMember
      5,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLimitedLiabilityCompanyMember
5,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLimitedLiabilityCompanyMember
 
Income taxes 4,000,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLimitedLiabilityCompanyMember
           
Impairment of long-lived intangible assets           600,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_MotorsportsAuthenticsLimitedLiabilityCompanyMember
 
Subsequent Event | Kansas Entertainment              
Schedule of Equity Method Investments [Line Items]              
Distribution in excess of profits             $ 5,500,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLLCMember
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