Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2014
Rig Assets Excluding Jackup Rigs
Property, Plant and Equipment
Operating rig asset depreciable life, operating days	4927 days
Non-operating rig asset depreciable life	20 years
Jack Up Rigs
Property, Plant and Equipment
Operating rig asset depreciable life, operating days	8030 days
Non-operating rig asset depreciable life	30 years
Building | Minimum
Property, Plant and Equipment
Estimated useful life	10 years
Building | Maximum
Property, Plant and Equipment
Estimated useful life	30 years
Well Servicing Rigs | Minimum
Property, Plant and Equipment
Estimated useful life	3 years
Well Servicing Rigs | Maximum
Property, Plant and Equipment
Estimated useful life	15 years
Transportation Equipment | Minimum
Property, Plant and Equipment
Estimated useful life	10 years
Transportation Equipment | Maximum
Property, Plant and Equipment
Estimated useful life	25 years
Oilfield Hauling and Mobile Equipment and Other Machinery and Equipment | Minimum
Property, Plant and Equipment
Estimated useful life	3 years
Oilfield Hauling and Mobile Equipment and Other Machinery and Equipment | Maximum
Property, Plant and Equipment
Estimated useful life	10 years