Basis of Presentation (Details 3) (As previously reported, USD $) In Millions, unless otherwise specified	Dec. 31, 2012
As previously reported
Reserve for principal receivable on a particular position within the company's financial instruments owned (error correction)	$ 1.9

Represents the amount of reserve for principal and interest due on a particular position within the entity's financial instruments owned.

No definition available.

Name:	glch_ReserveForPrincipalAndInterestDueOnFinancialInstrumentsOwned
Namespace Prefix:	glch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant