Legal Matters (Details) - WesternGeco [Member]			1 Months Ended			36 Months Ended
	Nov. 25, 2016 USD ($)	Aug. 31, 2012 USD ($)	Apr. 30, 2014 USD ($)	Oct. 31, 2013 USD ($)	Jun. 30, 2009 Patent	Jul. 02, 2015 USD ($)	Dec. 31, 2016 USD ($)	Nov. 24, 2016 USD ($)	Nov. 14, 2016 USD ($)	Nov. 13, 2016 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	May 31, 2014 USD ($)
Settled Litigation [Member]
Legal Matters (Textual) [Abstract]
Number of patent apparatus claims contained | Patent					4
Total damages awarded		$ 105,900,000				$ 123,800,000
Prejudgment interest expense accrued						10,900,000
Settled Litigation [Member] | Lost Royalties [Member]
Legal Matters (Textual) [Abstract]
Total damages awarded		12,500,000
Settled Litigation [Member] | Lost Profits [Member]
Legal Matters (Textual) [Abstract]
Total damages awarded		$ 93,400,000	$ 9,400,000	$ 73,100,000		$ 93,400,000
Reduction in damages awarded in case			$ 3,000,000
Accrual for loss contingency related to legal proceedings													$ 123,800,000
Pending Litigation [Member]
Legal Matters (Textual) [Abstract]
Appeal bond									$ 65,000,000	$ 120,000,000
Amount paid in royalty damages and interest	$ 20,800,000
Accrual for loss contingency related to legal proceedings	$ 0							$ 1,100,000			$ 22,000,000	$ 123,800,000
Approximate amount of potential new loss contingency							$ 44,000,000