Changes in Deferred Stock Units Related to Quarterly Grants (Detail) (Deferred Stock Units, USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of DSUs, Granted and vested	7,888	9,538	15,372	15,251
Expense Recognized, Granted and vested	$ 96	$ 88	$ 191	$ 176

Share based compensation arrangement by share based payment award equity instruments other than options granted and vested expense recognized.

No definition available.

Name:	icge_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedExpenseRecognized
Namespace Prefix:	icge_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration