Goodwill And Other Intangible Assets [Line Items]

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- Definition

Goodwill Discount Rate

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Section 45
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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

No definition available.

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- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

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Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 01, 2017 USD ($) Reporting_Unit	Dec. 31, 2017 USD ($) Reporting_Unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2018 USD ($)
Goodwill And Other Intangible Assets [Line Items]
Goodwill discount rate			10.00%	10.50%
Goodwill		$ 910,088	$ 910,088	$ 902,579	$ 901,928	$ 906,766
Business Acquisition, Intangible Assets		$ 4,538	4,538
Total amortization			53,701	55,987	59,161
Drilling And Production And Dover Energy Automation [Member]
Goodwill And Other Intangible Assets [Line Items]
Number of reporting units \| Reporting_Unit	2
Production And Automation Technologies And Drilling Technologies [Member]
Goodwill And Other Intangible Assets [Line Items]
Number of reporting units \| Reporting_Unit		2
Drilling and Production [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 733,641
Fair values excess in carrying values	90.00%
Dover Energy Automation [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 172,480
Fair values excess in carrying values	233.00%
Production and Automation Technologies [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 804,985	$ 808,952	808,952	801,443	800,792	805,630
Fair values excess in carrying values	69.00%
Drilling Technologies [Member]
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 101,136	$ 101,136	$ 101,136	$ 101,136	$ 101,136	$ 101,136
Fair values excess in carrying values	464.00%