No definition available.

Name:	get_AmortizationOfGainOnSwapAgreements
Namespace Prefix:	get_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Base amount added to accrued interest to compute termination fee under swap rate agreement

No definition available.

Name:	get_BaseAmountAddedToAccruedInterestToComputeTerminationFeeUnderSwapRateAgreement
Namespace Prefix:	get_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Base rate added to applicable margin of borrowings to compute weighted average fixed rate.

No definition available.

Name:	get_BaseRateAddedToApplicableMarginOfBorrowings
Namespace Prefix:	get_
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

The percentage points added to a specific reference rate to compute the variable rate on the Debt Instrument's interest rate.

No definition available.

Name:	get_DebtInstrumentSpreadRateAddedToSpecificReferenceRate
Namespace Prefix:	get_
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	get_DerivativeFinancialInformationTextualAbstract
Namespace Prefix:	get_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Derivative higher remaining maturity range for terminated derivatives.

No definition available.

Name:	get_DerivativeHigherRemainingMaturityRangeForTerminatedDerivatives
Namespace Prefix:	get_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

Derivative lower remaining maturity range for terminated derivatives.

No definition available.

Name:	get_DerivativeLowerRemainingMaturityRangeForTerminatedDerivatives
Namespace Prefix:	get_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

Number of natural gas derivatives terminated.

No definition available.

Name:	get_NumberOfNaturalGasDerivativesTerminated
Namespace Prefix:	get_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Payment of termination fee under swap rate agreement.

No definition available.

Name:	get_PaymentOfTerminationFeeUnderSwapRateAgreement
Namespace Prefix:	get_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	instant

Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a fuel oil forward purchase contract.

No definition available.

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

Name:	us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The high end of the range of time remaining until maturity when a range is presented for a group of derivatives.

No definition available.

Name:	us-gaap_DerivativeHigherRemainingMaturityRange
Namespace Prefix:	us-gaap_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

Name:	us-gaap_DerivativeInstrumentsGainRecognizedInIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of loss recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

Name:	us-gaap_DerivativeInstrumentsLossRecognizedInIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The low end of the range of time remaining until maturity when a range is presented for a group of derivatives.

No definition available.

Name:	us-gaap_DerivativeLowerRemainingMaturityRange
Namespace Prefix:	us-gaap_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

The number of derivative instruments of a particular group held by the entity.

No definition available.

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

This element represents the income received from or payment made to a third party in connection with the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one or the other party, a failure to perform.

No definition available.

Name:	us-gaap_GainLossOnContractTermination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

No definition available.

Name:	us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Percentage of an entity's outstanding debt that is designated as a hedged item in cash flow, fair value, or net investment hedge.

No definition available.