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v3.5.0.2

Subsequent Events (Details) - shares |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 03, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class A [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock options terminated |  | 24,000 | 8,000 |
Options outstanding |  | 632,000 | 487,000 | 568,000
Class B [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock options terminated |  |  |  |
Options outstanding |  |  |  | 185,000
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Options outstanding | 582,000 |  |  |
Subsequent Event [Member] | Class A [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock options terminated | 50,000 |  |  |
Subsequent Event [Member] | Class B [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares held by estate | 100,000 |  |  |

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- Definition Common Stock, Shares Held in Estate + References No definition available. + Details
Name: | rdi_CommonStockSharesHeldInEstate
Namespace Prefix: | rdi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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