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CONCENTRATION OF CREDIT RISK (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues | Largest customer
CONCENTRATION OF CREDIT RISK
Concentration risk percentage	12.00%	16.00%	17.00%
Accounts receivable | Customer concentration risk | Two customers
CONCENTRATION OF CREDIT RISK
Number of customers		2	2
Accounts receivable | Customer concentration risk | Customer One
CONCENTRATION OF CREDIT RISK
Concentration risk percentage	27.00%	29.00%	13.00%
Accounts receivable | Customer concentration risk | Customer Two
CONCENTRATION OF CREDIT RISK
Concentration risk percentage	16.00%	23.00%	12.00%
Accounts receivable | Customer concentration risk | Three customers
CONCENTRATION OF CREDIT RISK
Number of customers	3
Accounts receivable | Customer concentration risk | Customer Three
CONCENTRATION OF CREDIT RISK
Concentration risk percentage	15.00%
Purchases | Vendor concentration risk
CONCENTRATION OF CREDIT RISK
Concentration risk percentage		12.00%
Number of vendors		1

X

- Definition

Represents the number of major customers.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of major vendors.

+ References

No definition available.

+ Details

Name:	tge_NumberOfVendors
Namespace Prefix:	tge_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskLineItems
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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration