Restructuring Activities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended				12 Months Ended
	Mar. 31, 2010	Dec. 31, 2012 Stafford, Texas-based Operations [Member] Facility Closing [Member]	Dec. 31, 2010 Stafford, Texas-based Operations [Member] Facility Closing [Member]	Dec. 31, 2011 Stafford, Texas-based Operations [Member] Facility Closing [Member]	Mar. 31, 2010 Stafford, Texas-based Operations [Member] Facility Closing [Member]	Dec. 31, 2012 Sensor Geophone Operations [Member]	Dec. 31, 2011 Sensor Geophone Operations [Member]	Dec. 31, 2012 Sensor Geophone Operations [Member] Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Fair value of remaining cost to be incurred under ceased lease facility					$ 8.2
Charge of loss on disposition of land equipment businesses	5.0		5.0
Restructuring liability reserve				5.9				0.1
Cash payments for restructuring		1.2
Accrued accretion expense		0.4
Remaining restructuring liability		5.1
Percentage of headcount reduction							30.00%
Accrued liability associated with severance						$ 2.3	$ 2.4