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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance | $ 166,917,000 | $ 166,659,000
Acquisitions and purchase price adjustment | 5,690,000 |
Cumulative Translation Adjustment | 619,000 | 258,000
Goodwill - Ending Balance | $ 173,226,000 | 166,917,000
Goodwill |  |
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent) | 3.00% |
Discontinued Operation, additional disclosures |  |
Goodwill for the consolidated company, expected to be deductible for tax purposes | $ 10,200,000 |
United States |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance | 50,149,000 | 50,149,000
Goodwill - Ending Balance | 50,149,000 | 50,149,000
International |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance | 75,634,000 | 75,634,000
Goodwill - Ending Balance | 75,634,000 | 75,634,000
Rig Technologies |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance | 41,134,000 | 40,876,000
Acquisitions and purchase price adjustment | 5,690,000 |
Cumulative Translation Adjustment | 619,000 | 258,000
Goodwill - Ending Balance | $ 47,443,000 | $ 41,134,000

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- Definition The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value also includes purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value. + References No definition available. + Details
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- Definition Represents goodwill for the consolidated company, expected to be deductible for tax purposes. + References No definition available. + Details
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- Definition Represents the growth rate used to calculate terminal values for each reporting unit using a Gordon Growth methodology. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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