Employee Benefits (Amounts Expected To Be Amortized From Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Employee Benefits [Abstract]
Net actuarial gain	$ 177

Defined Benefit Plan, Expected Amortization Of Net Gain Loss In Next Twelve Months

No definition available.

Name:	rno_DefinedBenefitPlanExpectedAmortizationOfNetGainLossInNextTwelveMonths
Namespace Prefix:	rno_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration