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Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Abstract]    
Equipment $ 6,891,544us-gaap_MachineryAndEquipmentGross $ 6,679,894us-gaap_MachineryAndEquipmentGross
Oil and natural gas properties 200,390us-gaap_OilAndGasPropertySuccessfulEffortMethodGross 196,234us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Buildings 88,393us-gaap_BuildingsAndImprovementsGross 83,465us-gaap_BuildingsAndImprovementsGross
Land 12,024us-gaap_Land 12,038us-gaap_Land
Property, Plant and Equipment, Gross, Total 7,192,351us-gaap_PropertyPlantAndEquipmentGross 6,971,631us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and impairment (2,969,947)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,840,560)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 4,222,404us-gaap_PropertyPlantAndEquipmentNet $ 4,131,071us-gaap_PropertyPlantAndEquipmentNet