DETAIL OF SELECTED BALANCE SHEET ACCOUNTS - Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	123,208us-gaap_PropertyPlantAndEquipmentGross	96,443us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	(46,112)	(31,871)
Property and equipment, net	77,096us-gaap_PropertyPlantAndEquipmentNet	64,572us-gaap_PropertyPlantAndEquipmentNet
Field operating equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	100,379	85,990
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,851	3,550
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	498	455
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,672	1,122
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,808	4,358
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,000	968
Minimum \| Field operating equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years
Minimum \| Vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years
Minimum \| Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years	2 years
Minimum \| Software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years
Minimum \| Computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years
Minimum \| Office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years	3 years
Maximum \| Field operating equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years	10 years
Maximum \| Vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years	5 years
Maximum \| Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years	5 years
Maximum \| Software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years	5 years
Maximum \| Computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years	5 years
Maximum \| Office equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years	5 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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

+ Details

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- Details

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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