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INCOME TAXES (Details)	3 Months Ended
	Mar. 31, 2013
INCOME TAXES [Abstract]
Deficiency assessment statute limitation period (in years)	3 years

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- Definition

Represents deficiency assessment statute limitation period. A statue of limitation is an enactment in a common law legal system that sets the maximum time after an event, that legal proceeding based that event may be initiated.

+ References

No definition available.

+ Details

Name:	ptsi_DeficiencyAssessmentStatuteLimitationPeriod
Namespace Prefix:	ptsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Details

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