Concentrations of Credit and Liquidity Risk (Details) (Borrowings, Risk related to lenders, ClearPoint)	12 Months Ended
Dec. 31, 2012 item
Borrowings \| Risk related to lenders \| ClearPoint
Concentrations of Credit and Liquidity Risk
Number of lenders to finance activities	2

Represents the number of lenders to finance activities.

No definition available.

Name:	glch_NumberOfLendersToFinanceActivities
Namespace Prefix:	glch_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration