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.

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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611

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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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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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Number of individual customers accounted for more than ten percent of revenue.

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- Definition

Number of ultra-deepwater drillships for supervise and manage construction.

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Number of ultra deepwater drillships to manage preservation.

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Business Segment and Significant Customer Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 Segment Customer	Mar. 31, 2017 Customer	Jan. 31, 2017 Drillship	Sep. 30, 2013 Drillship
Entity Wide Revenue Major Customer [Line Items]
Number of reportable segments \| Segment	1
Number of ultra deepwater drillships for supervise and manage construction				2
Number of ultra deepwater drillships to manage preservation			2
Number of customers accounted for revenues \| Customer	3	3
Product Concentration Risk \| Sales \| Ultra Deep Water Drillship
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue	0.50%	1.00%
Customer Concentration Risk \| Sales \| Customer One
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue	46.00%	64.00%
Customer Concentration Risk \| Sales \| Customer Two
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue	17.00%	19.00%
Customer Concentration Risk \| Sales \| Customer Three
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue	11.00%	14.00%