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Summary of Company's Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net Revenues	$ 27,942us-gaap_Revenues	$ 68,551us-gaap_Revenues	$ 49,108us-gaap_Revenues	$ 169,899us-gaap_Revenues
Income (loss) from operations	(8,549)us-gaap_OperatingIncomeLoss	15,956us-gaap_OperatingIncomeLoss	(18,437)us-gaap_OperatingIncomeLoss	51,623us-gaap_OperatingIncomeLoss
Seismic \| Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	22,781	63,703	38,374	158,930
Income (loss) from operations	(5,744)	19,473	(13,129)	58,016
Non-Seismic \| Operating Segments
Segment Reporting Information [Line Items]
Net Revenues	5,019	4,795	10,450	10,707
Income (loss) from operations	502	263	1,360	1,037
Corporate \| Corporate, Non-Segment
Segment Reporting Information [Line Items]
Net Revenues	142	53	284	262
Income (loss) from operations	$ (3,307)	$ (3,780)	$ (6,668)	$ (7,430)