Summary Of Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	12 Months Ended
	Dec. 31, 2011 years
Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	20
Estimated useful lives, maximum, years	30
Well Service Units And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	3
Estimated useful lives, maximum, years	15
Fluid Services Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	5
Estimated useful lives, maximum, years	10
Brine And Fresh Water Stations [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum, years	15
Frac/Test Tanks [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum, years	10
Pressure Pumping Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	5
Estimated useful lives, maximum, years	10
Construction Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	3
Estimated useful lives, maximum, years	10
Contract Drilling Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	3
Estimated useful lives, maximum, years	10
Disposal Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	10
Estimated useful lives, maximum, years	15
Vehicles [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	3
Estimated useful lives, maximum, years	7
Rental Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum, years	2
Estimated useful lives, maximum, years	15
Aircraft [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum, years	5
Software And Computers [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum, years	3