Acquisition (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2011	Feb. 12, 2010 sqmi
Business Combinations [Abstract]
Consideration value		$ 202.8
Square miles of data added to multi client seismic data library		5,500
Reduction in value of property and equipment	(1.1)
Increase in goodwill	$ 1.1

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete.

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- Definition

Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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