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Recently Issued Accounting Standards (Details)	3 Months Ended
	Mar. 31, 2017 item
Recently Issued Accounting Standards
Number of primary revenue streams	2

X

- Definition

Represents the number of primary revenue streams of the entity.

+ References

No definition available.

+ Details

Name:	hp_NumberOfRevenueStreams
Namespace Prefix:	hp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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