Litigation (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended	0 Months Ended	1 Months Ended		0 Months Ended
	Jun. 30, 2009 WesternGeco [Member] Patent	Sep. 30, 2013 WesternGeco [Member]	Jun. 30, 2013 WesternGeco [Member]	Mar. 31, 2013 WesternGeco [Member]	May 31, 2012 Fletcher [Member]	Aug. 16, 2012 Pending Litigation [Member] WesternGeco [Member]	Oct. 24, 2013 Settled Litigation [Member] WesternGeco [Member]	Aug. 16, 2012 Lost Royalties [Member] Pending Litigation [Member] WesternGeco [Member]	Aug. 16, 2012 Lost Profits [Member] Pending Litigation [Member] WesternGeco [Member]	Oct. 24, 2013 Lost Profits [Member] Settled Litigation [Member] WesternGeco [Member]
Litigation (Textual) [Abstract]
Number of patent apparatus claims contained	4
Total damages awarded						$ 105.9	$ 105.9	$ 12.5	$ 93.4	$ 73.1
Accrual for loss contingency related to legal proceedings		191.8	120.0	10.0
Principal amount of promissory note					$ 35