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Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Significant Accounting Policies [Abstract]
Cash and cash equivalents orginal maturity	three months or less

X

- Definition

Cash and cash equivalents original maturity.

+ References

No definition available.

+ Details

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X

- Definition

Disclosure of significant accounting policies.

+ References

No definition available.

+ Details

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Namespace Prefix:	pds_
Data Type:	xbrli:stringItemType
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