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Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
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Apr. 01, 2014 Segment Business | Apr. 01, 2014 Business | Apr. 01, 2014 Rig Systems [Member] Business | Apr. 01, 2014 Rig Aftermarket [Member] Business | Sep. 30, 2013 Wellbore Technologies [Member] | Sep. 30, 2013 Wellbore Technologies [Member] | Apr. 01, 2014 Wellbore Technologies [Member] Business | Apr. 01, 2014 Completion & Production Solutions [Member] Business | Sep. 30, 2014 Revenue [Member] | Sep. 30, 2013 Revenue [Member] | Sep. 30, 2014 Revenue [Member] | Sep. 30, 2013 Revenue [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | 4 |  |  |  |  |  |  |  |  |  |  |
Number of business units |  | 15 | 2 | 1 |  |  | 6 | 6 |  |  |  |
Net gains from legal settlement |  |  |  |  | $ 102 | $ 102 |  |  |  |  |  |
Revenue from shipyard customer |  |  |  |  |  |  |  |  | 8.00% | 11.00% | 8.00% | 11.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References 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=25496072&loc=d3e14326-108349 + Details
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