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Derivative Instruments (Set Forth Terms Of Interest Rate Swap Derivative Instruments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Interest Rate Swap June 30, 2016 [Member]
Derivative [Line Items]
Notional Amount	$ 49,446,650invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeOneMember
Fixed interest rate	5.50%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeOneMember
Receive Variable Rate	2.688%us-gaap_DerivativeVariableInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeOneMember
Maturity Date	Jun. 30, 2016
Interest Rate Swap 1.15% October 31, 2017 [Member]
Derivative [Line Items]
Notional Amount	28,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeTwoMember
Fixed interest rate	1.15%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeTwoMember
Receive Variable Rate	0.169%us-gaap_DerivativeVariableInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeTwoMember
Maturity Date	Oct. 31, 2017
Interest Rate Swap 1.2% October 31, 2017 [Member]
Derivative [Line Items]
Notional Amount	27,913,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeThreeMember
Fixed interest rate	1.20%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeThreeMember
Receive Variable Rate	0.233%us-gaap_DerivativeVariableInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeThreeMember
Maturity Date	Oct. 31, 2017
Interest Rate Cap June 1, 2018 [Member]
Derivative [Line Items]
Notional Amount	$ 7,500,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeFourMember
Fixed interest rate	4.00%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = rdi_InterestRateDerivativeFourMember
Maturity Date	Jun. 01, 2018

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=rdi_InterestRateDerivativeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=rdi_InterestRateDerivativeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=rdi_InterestRateDerivativeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=rdi_InterestRateDerivativeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: