The effect of a change in enacted tax laws or rates, tax status, or judgment on the realizability of a beginning-of-the-year deferred tax asset in future years that is recognized in the interim period in which the change occurs.

No definition available.

Name:	iilg_IncomeTaxExpenseRelatedToRateChangeImpactOnForeignDeferredBalance
Namespace Prefix:	iilg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

INCOME TAXES (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
	Sep. 30, 2013	Oct. 31, 2013 State taxing authority	Apr. 30, 2013 U.K. Finance Act of 2012	Apr. 30, 2012 U.K. Finance Act of 2012	Apr. 30, 2015 U.K. Finance Act of 2013	Apr. 30, 2014 U.K. Finance Act of 2013
Income Taxes
U.K. corporate income tax rate (as a percent)			23.00%	24.00%	20.00%	21.00%
Decrease in U.K. deferred tax asset	$ 0.6
Decrease in unrecognized tax benefits for state income tax items		$ 1.1