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Equity And Stock-Based Compensation (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Equity And Stock-Based Compensation [Line Items] |  |  |
Unrecognized tax benefits from stock option exercises | $ 0 us-gaap_DeferredTaxExpenseFromStockOptionsExercised | $ 0 us-gaap_DeferredTaxExpenseFromStockOptionsExercised |
Grant date fair value of options vesting | 57,000 rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedGrantDateFairValue | 34,000 rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedGrantDateFairValue |
Unrecognized estimated compensation cost related to non-vested stock options granted | 427,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Recognition period of unrecognized compensation cost | 2 years 4 months 17 days |  |
Intrinsic unrealized value of all options outstanding, vested and expected to vest | 2,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue |  |
Percentage of option currently exercisable | 63.00%rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOptionsExercisable |  |
Expiration period for stock options | 10 years |  |
Common Stock authorized for issuance under 2010 Stock Incentive Plan | 1,250,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |
Weighted average remaining contractual life of all options outstanding, vested, and expected to vest | 2 years 7 months 21 days |  | 2 years 5 months 9 days
Weighted average remaining contractual life of the exercisable options outstanding | 3 years 18 days |  | 3 years 1 month 10 days
Class A Nonvoting Common Stock [Member] | Executive Officer [Member] |  |  |
Equity And Stock-Based Compensation [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 |
Class A Nonvoting Common Stock [Member] | Employee/Director [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Realized value of option exercised | 320,000 rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardRealizableValueOfOptionExercised / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember / us-gaap_TitleOfIndividualAxis = rdi_EmployeeDirectorMember |  |
Cash received from exercise of stock options | 326,000 us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember / us-gaap_TitleOfIndividualAxis = rdi_EmployeeDirectorMember |  |
Class A [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Compensation expense | $ 300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 187,500 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Options granted | 12,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 20,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 80,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Options exercised | 47,500 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 157,600 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Options granted |  |  |
Minimum [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Vesting period of stock options | 0 years |  |
Maximum [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Vesting period of stock options | 4 years |  |

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- Definition Expiration Period For Incentive Plan Stock Options + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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