Acquisitions and Dispositions (Details 1)	3 Months Ended
	Mar. 31, 2012 Optima Solutions [Member] USD ($)	Mar. 09, 2012 Optima Solutions [Member] USD ($)	Mar. 09, 2012 Optima Solutions [Member] GBP (£)	Apr. 23, 2012 Eastern Reservoir Services [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		$ 65,000,000	£ 41,200,000	$ 42,500,000	$ 55,500,000
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, deferred and other tax liabilities		7,200,000
Purchase price allocation, liabilities associated with contingent purchase price consideration		3,500,000
Purchase price allocation, nondeductible goodwill		35,600,000		20,600,000	34,300,000
Revenues from acquired entitiy	1,500,000
Depreciation and amortization from acquired entity	400,000
Pretax earnings from acquired entity	500,000
Transaction costs associated with acquisition	$ 1,300,000