The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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