Acquisitions and Dispositions (Details 1)	9 Months Ended			9 Months Ended		9 Months Ended
	Sep. 30, 2012 Optima Solutions [Member] USD ($)	Mar. 09, 2012 Optima Solutions [Member] USD ($)	Mar. 09, 2012 Optima Solutions [Member] GBP (£)	Sep. 30, 2012 Eastern Reservoir Services [Member] USD ($)	Apr. 23, 2012 Eastern Reservoir Services [Member] USD ($)	Sep. 30, 2012 Greywolf Production Systems [Member] USD ($)	Jul. 31, 2012 Greywolf Production Systems [Member] USD ($)
Business Acquisitions [Line Items]
Percentage of outstanding common stock acquired		100.00%	100.00%
Purchase price			£ 41,200,000		$ 42,500,000		$ 55,500,000
Purchase price (USD equivalent)		65,000,000
Contingent consideration, maximum possible payment			4,000,000
Purchase price allocation, net working capital		3,000,000
Purchase price allocation, property, plant, and equipment		16,800,000			18,500,000		17,700,000
Purchase price allocation, intangible assets		20,400,000			3,400,000		3,500,000
Purchase price allocation, other liabilities		3,500,000
Purchase price allocation, deferred tax liabilities		6,100,000
Purchase price allocation, nondeductible goodwill		34,500,000			20,600,000		34,300,000
Revenues from acquired entitiy	15,100,000			16,000,000		5,900,000
Depreciation and amortization from acquired entity	3,100,000			1,800,000		400,000
Pretax earnings from acquired entity	3,600,000			4,700,000		1,200,000
Transaction costs associated with acquisition		$ 1,300,000			$ 500,000		$ 700,000