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Common Stock (Details) (USD $) | 3 Months Ended | 0 Months Ended | 11 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | May 16, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | May 14, 2004
Common Stock [Line Items] |  |  |  |  |
Repurchase program, amount repurchased | $ 1,828,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |
May 2014 Stock Repurchase Plan [Member] |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |
Repurchase program, amount authorized |  | 10,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_ShareRepurchaseProgramAxis = rdi_MayTwoThousandFourteenStockRepurchasePlanMember |  |  |
Repurchase program, amount repurchased |  |  | 5,900,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = rdi_MayTwoThousandFourteenStockRepurchasePlanMember |  |
Repurchase program, remaining amount authorized | $ 4,100,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount / us-gaap_ShareRepurchaseProgramAxis = rdi_MayTwoThousandFourteenStockRepurchasePlanMember |  |  |  |
May 2004 Stock Repurchase Plan [Member] |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |
Repurchase program, shares authorized |  |  |  |  | 350,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = rdi_MayTwoThousandFourStockRepurchasePlanMember
Executive Officer [Member] | Class A Nonvoting Common Stock [Member] |  |  |  |  |
Common Stock [Line Items] |  |  |  |  |
Stocks granted | 160,643 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |  |  | 125,209 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |

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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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