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EQUITY AND OTHER INVESTMENTS - Distributions from Kansas Entertainment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Equity Method Investments and Joint Ventures, Distributions [Line Items]      
Equity investments income/(loss) $ 8,916us-gaap_IncomeLossFromEquityMethodInvestments $ 9,434us-gaap_IncomeLossFromEquityMethodInvestments $ 2,757us-gaap_IncomeLossFromEquityMethodInvestments
Distribution in excess of profits 10,076us-gaap_EquityMethodInvestmentDividendsOrDistributions 8,216us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions
Total Distributions 22,000isca_EquityMethodInvestmentIncomeLossandDividendsorDistributions 21,500isca_EquityMethodInvestmentIncomeLossandDividendsorDistributions 11,000isca_EquityMethodInvestmentIncomeLossandDividendsorDistributions
Kansas Entertainment Limited Liability Company | Cash Distribution      
Equity Method Investments and Joint Ventures, Distributions [Line Items]      
Equity investments income/(loss) 10,076us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
8,216us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
Distribution in excess of profits $ 11,924us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
$ 13,284us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember
$ 11,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis
= us-gaap_CashDistributionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= isca_KansasEntertainmentLimitedLiabilityCompanyMember