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Business Segments and Geographic Areas - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 Business Customer Segment | Dec. 31, 2015 Customer | Dec. 31, 2014 Customer
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Number of business units | 17 |  |
Customer Concentration Risk [Member] | Revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of customers | Customer | 0 | 0 | 0
Concentration risk, percentage | 10.00% | 10.00% | 10.00%
Rig Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of business units | 1 |  |
Rig Aftermarket [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of business units | 1 |  |
Wellbore Technologies [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of business units | 6 |  |
Completion & Production Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of business units | 9 |  |

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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 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: 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=73719730&loc=d3e13531-108611 Reference 3: 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=64851502&loc=d3e6404-108592 Reference 4: 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=73719730&loc=d3e13537-108611 + Details
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