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Business Segments and Geographic Areas - Additional Information (Detail)	12 Months Ended
	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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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
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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