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Revenues - Payment Terms (Details)	12 Months Ended
	Dec. 31, 2020
Minimum
Revenue satisfaction period	30 days
Maximum
Revenue satisfaction period	60 days

X

- Definition

The satisfaction period of revenue remaining performance obligation.

+ References

No definition available.

+ Details

Name:	res_RevenueRemainingPerformanceObligationSatisfactionPeriod
Namespace Prefix:	res_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: