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Goodwill by Operating Segment (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Goodwill [Line Items] |
Balance at beginning of period | $ 410,756
Changes to goodwill | 2,104
Balance at end of period | 412,860
Contract Drilling |
Goodwill [Line Items] |
Balance at beginning of period | 395,060
Balance at end of period | 395,060
Other Operations |
Goodwill [Line Items] |
Balance at beginning of period | 15,696
Changes to goodwill | 2,104
Balance at end of period | $ 17,800

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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