Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,758,357	$ 1,539,275
Less accumulated depreciation and amortization	814,591	682,863
Property and equipment, net	943,766	856,412
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,338	11,314
Buildings And Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,831	47,710
Well Service Units And Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	487,785	447,743
Fluid Services Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	218,933	179,495
Brine And Fresh Water Stations
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,101	13,000
Frac/test tanks
Property, Plant and Equipment [Line Items]
Property and equipment, gross	274,311	246,816
Pressure Pumping Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	277,529	246,931
Construction Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,657	29,281
Contract Drilling Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	105,992	93,728
Disposal Facilities
Property, Plant and Equipment [Line Items]
Property and equipment, gross	119,903	78,632
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,802	54,238
Rental Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	65,047	46,851
Aircraft
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,151	4,251
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,921	23,595
Other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,055	$ 15,690