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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected power generating capacity.

No definition available.

Name:	ora_ExpectedPowerGeneratingCapacity
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Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

Number of phases of construction.

No definition available.

Name:	ora_NumberOfPhasesOfConstruction
Namespace Prefix:	ora_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Related to power utilization.

No definition available.

Name:	ora_PowerUtilization
Namespace Prefix:	ora_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

The length of the agreement term on the power plant usage.

No definition available.

Name:	ora_PowerplantUsageAgreementTerm
Namespace Prefix:	ora_
Data Type:	xbrli:durationItemType
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Period Type:	duration

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580

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The proportionate share of interest (percent) in a jointly owned utility plant.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033

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Data Type:	num:percentItemType
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The cash outflow from the amount invested for projects in hopes of getting a future return or interest from it.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585