Restructuring Activities	12 Months Ended
Restructuring Activities	Dec. 31, 2012
Restructuring and Related Activities [Abstract]
Restructuring Activities	Restructuring Activities Due to the formation of INOVA Geophysical, the Company consolidated certain of its Stafford, Texas-based operations, which resulted in the Company permanently ceasing to use certain leased facilities as of March 31, 2010. The Company determined that the fair value of its remaining costs to be incurred under its lease of these facilities was approximately $8.2 million. After considering all deferred items on the Company’s balance sheet associated with this lease, the Company recorded a charge to its loss on the disposition of its land equipment businesses of $5.0 million. As of December 31, 2011, the Company had a liability of $5.9 million. During 2012, the Company made cash payments of $1.2 million and accrued $0.4 million related to accretion expense, resulting in a remaining liability of $5.1 million as of December 31, 2012. In 2011, the Company initiated a restructuring of its Sensor geophone operations in the Netherlands, which included reducing headcount at this location by approximately 30%. As of December 31, 2011, the Company accrued a liability of $2.4 million associated with severance costs for these employees and recorded the corresponding expense within general, administrative and other operating expenses for 2011. During 2012, the Company made cash severance payments of $2.3 million, resulting in a remaining liability of less than $0.1 million as of December 31, 2012.

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

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