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Casualty Loss (Details) - Wellington, New Zealand [Member]	Dec. 31, 2015
Casualty Loss [Line Items]
Percentage of code met	35.00%
Percentage of code goal	70.00%

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- Definition

Casualty Loss [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	rdi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Percentage Of Code Goal

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No definition available.

+ Details

Name:	rdi_PercentageOfCodeGoal
Namespace Prefix:	rdi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Percentage Of Code Met

+ References

No definition available.

+ Details

Name:	rdi_PercentageOfCodeMet
Namespace Prefix:	rdi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_StatementGeographicalAxis=rdi_WellingtonNewZealandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: