Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
May. 31, 2015	May. 31, 2014
Statement of Comprehensive Income [Abstract]
Amortization of interest rate swap, net of tax benefit	$ 106	$ 106

Other Comprehensive Income, Amortization Adjustments on Derivatives, Included in Net Income, Tax

No definition available.

Name:	isca_OtherComprehensiveIncomeAmortizationAdjustmentsOnDerivativesIncludedInNetIncomeTax
Namespace Prefix:	isca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration