XML 57 R65.htm IDEA: XBRL DOCUMENT v2.4.1.9
COMMITMENTS AND CONTINGENCIES - Additional Information (Details) (USD $)
 12 Months Ended 1 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Oct. 31, 2002
Commitments and Contingencies Disclosure [Line Items]        
Period of continuous service to be eligible to participate in the ISC plan 1 month      
Period of continuous service to be eligible for matching contributions 12 months      
Percentage vested upon entrance into the ISC plan 100.00%isca_DefinedContributionPlanEmployeeVestingPercentage      
Contribution expense $ 1,600,000us-gaap_DefinedContributionPlanCostRecognized $ 1,400,000us-gaap_DefinedContributionPlanCostRecognized $ 1,400,000us-gaap_DefinedContributionPlanCostRecognized  
Estimated cost to complete approved projects and current construction in progress 172,300,000isca_EstimatedCostToCompleteApprovedProjectsAndCurrentConstructionInProgress      
Proceeds from long-term debt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 100,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt  
Long-term debt 271,746,000us-gaap_LongTermDebt 274,487,000us-gaap_LongTermDebt    
Operating leases and all other short-term rentals expense 14,700,000us-gaap_LeaseAndRentalExpense 13,500,000us-gaap_LeaseAndRentalExpense 13,500,000us-gaap_LeaseAndRentalExpense  
Standby letter of credit agreements in favor of third parties 4,000,000isca_StandbyLettersOfCredit      
2002 STAR Bonds        
Commitments and Contingencies Disclosure [Line Items]        
Proceeds from long-term debt       6,300,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_GuaranteeObligationsByNatureAxis
= isca_RevenueBondsMember
Frequency of periodic payment       annual
Debt, maturity date       Dec. 01, 2022
Long-term debt $ 1,400,000us-gaap_LongTermDebt
/ us-gaap_GuaranteeObligationsByNatureAxis
= isca_RevenueBondsMember