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Property, Plant and Equipement (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2014
Property, Plant and Equipment
Gross	$ 345,619,000	$ 337,922,000
Less accumulated depreciation	(198,052,000)	(173,428,000)
Net property, plant and equipment	147,567,000	164,494,000
Land, building and other
Property, Plant and Equipment
Gross	$ 16,357,000	$ 15,472,000
Land, building and other | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	3 years	3 years
Land, building and other | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	40 years	40 years
Recording equipment
Property, Plant and Equipment
Gross	$ 212,541,000	$ 206,517,000
Recording equipment | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	5 years	5 years
Recording equipment | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	10 years	10 years
Line clearing equipment
Property, Plant and Equipment
Gross	$ 1,071,000	$ 1,084,000
Estimated useful lives of property, plant and equipment	5 years	5 years
Vibrator energy sources
Property, Plant and Equipment
Gross	$ 80,454,000	$ 78,119,000
Vibrator energy sources | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	5 years	5 years
Vibrator energy sources | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	15 years	15 years
Vehicles
Property, Plant and Equipment
Gross	$ 35,196,000	$ 36,730,000
Vehicles | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	1 year 6 months	1 year 6 months
Vehicles | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	10 years	10 years

X

- Definition

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

+ 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 (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

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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 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 2: 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 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

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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.

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