Business Combination, EBITDA Attributable to Operations, Earn-out, Percentage

No definition available.

Name:	spke_BusinessCombinationEBITDAAttributabletoOperationsEarnoutPercentage
Namespace Prefix:	spke_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Exercise of Conversion Rights, Term

+ References

No definition available.

+ Details

Name:	spke_DebtInstrumentExerciseofConversionRightsTerm
Namespace Prefix:	spke_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Minimum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	spke_LineofCreditFacilityMinimumBorrowingCapacity
Namespace Prefix:	spke_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of Customers

+ References

No definition available.

+ Details

Name:	spke_NumberofCustomers
Namespace Prefix:	spke_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

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

- Definition

Face amount or stated value per share of common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=spke_SeniorSecuredRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=spke_CenstarConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=spke_OasisPowerHoldingsConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=spke_CenStarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=spke_OasisPowerHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Acquisitions (Details) $ / shares in Units, customer in Thousands, $ in Millions	Jul. 31, 2015 USD ($) state customer $ / shares	Jul. 08, 2015 USD ($) customer $ / shares	Jun. 30, 2015 $ / shares	Dec. 31, 2014 $ / shares	Aug. 01, 2014 $ / shares
Common Class B
Subsequent Event [Line Items]
Common stock, par value \| $ / shares			$ 0.01	$ 0.01	$ 0.01
Subsequent Event \| Common Class B
Subsequent Event [Line Items]
Common stock, par value \| $ / shares		$ 0.01
Subsequent Event \| Senior Secured Revolving Credit Facility
Subsequent Event [Line Items]
Minimum availability of borrowing		$ 5.0
Subsequent Event \| Convertible Debt [Member] \| Censtar Convertible Debt
Subsequent Event [Line Items]
Annual interest rate		5.00%
Exercise of conversion rights term		18 months
Subsequent Event \| Convertible Debt [Member] \| Censtar Convertible Debt \| Common Class B
Subsequent Event [Line Items]
Conversion price per share \| $ / shares		$ 16.57
Subsequent Event \| Convertible Debt [Member] \| Oasis Power Holdings Convertible Debt
Subsequent Event [Line Items]
Annual interest rate	5.00%
Exercise of conversion rights term	18 months
Subsequent Event \| Convertible Debt [Member] \| Oasis Power Holdings Convertible Debt \| Common Class B
Subsequent Event [Line Items]
Conversion price per share \| $ / shares	$ 14.00
Subsequent Event \| CenStar
Subsequent Event [Line Items]
Number of customers \| customer		75
Purchase price		$ 8.3
EBITDA attributable to operations earn-out percentage		50.00%
Subsequent Event \| CenStar \| Senior Secured Revolving Credit Facility
Subsequent Event [Line Items]
Acquisition liabilities incurred		$ 6.2
Subsequent Event \| CenStar \| Convertible Debt [Member] \| Censtar Convertible Debt
Subsequent Event [Line Items]
Acquisition liabilities incurred		$ 2.1
Subsequent Event \| Oasis Power Holdings
Subsequent Event [Line Items]
Number of customers \| customer	40
Number of states in which company operates \| state	6
Purchase price	$ 20.0
Subsequent Event \| Oasis Power Holdings \| Senior Secured Revolving Credit Facility
Subsequent Event [Line Items]
Acquisition liabilities incurred	15.0
Subsequent Event \| Oasis Power Holdings \| Convertible Debt [Member] \| Oasis Power Holdings Convertible Debt
Subsequent Event [Line Items]
Acquisition liabilities incurred	$ 5.0