SIGNIFICANT ACCOUNTING POLICIES - Government subsidies (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SIGNIFICANT ACCOUNTING POLICIES
Government subsidy income	$ 1,682	$ 1,438	$ 3,614
Government subsidy recognized as reduction of cost of revenues	$ 0		$ 0

Amount of income earned in the form of government subsidy recognized as deduction of cost of revenues.

No definition available.

Name:	GEHI_GovernmentSubsidyIncomeAsDeductionOfCostOfRevenues
Namespace Prefix:	GEHI_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration