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
Mar. 31, 2014	Mar. 31, 2013
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of DSUs, Granted and vested	5,913	7,484
Expense Recognized, Granted and vested	$ 79	$ 95

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