Commitments and Contingencies (Details 3) - USD ($)		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Self-Insurance disclosures
Employer's liability claims subject to per-occurrence deductible	$ 3,000,000	$ 3,000,000
Workers automobile claims	2,500,000	2,500,000
General liability claims subject to per-occurrence deductible	5,000,000	5,000,000
Deductions in land rigs and for offshore rigs	5,000,000	5,000,000
Self-insurance accruals	165,900,000	165,900,000	$ 198,100,000
Self-insurance recoveries/receivables	25,900,000	25,900,000	$ 39,900,000
Petrello
Self-Insurance disclosures
Base salary		1,575,000
Chief Financial Officer
Self-Insurance disclosures
Reduced employment annual base salary	585,000
South America Africa the Middle East and Asia Excluding Colombia
Self-Insurance disclosures
Political risk insurance losses deductible	250,000	250,000
COLOMBIA
Self-Insurance disclosures
Political risk insurance deductible for foreign operation	$ 500,000	500,000
Mexico | Minimum
Income tax
Aggregate remaining amounts assessed or expected to assessed range		25,000,000
Mexico | Maximum
Income tax
Aggregate remaining amounts assessed or expected to assessed range		$ 30,000,000