Acquisition - Schedule of Operations on Pro Forma Basis (Details) - En Pointe Technologies Sales Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net sales	$ 404,933	$ 453,785	$ 1,297,790	$ 1,301,031
Operating profit (loss)	956	3,677	(2,450)	16,693
Income (loss) from continuing operations	(483)	1,569	(3,281)	7,774
Net income (loss)	$ (785)	$ 1,312	$ (3,540)	$ 6,672
Basic and Diluted Earnings (Loss) Per Common Share Basic	$ (0.07)	$ 0.11	$ (0.29)	$ 0.55
Basic and Diluted Earnings (Loss) Per Common Share Diluted	$ (0.07)	$ 0.10	$ (0.29)	$ 0.52
Weighted average number of common shares outstanding: Basic	11,976	12,367	12,101	12,217
Weighted average number of common shares outstanding: Diluted	11,976	12,954	12,101	12,871

Business Acquisition ProForma Weighted Average Number of Common Shares Outstanding Basic.

No definition available.

Name:	PCMI_BusinessAcquisitionProFormaWeightedAverageNumberOfCommonSharesOutstandingBasic
Namespace Prefix:	PCMI_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Acquisition ProForma Weighted Average Number of Common Shares Outstanding Diluted.

+ References

No definition available.

+ Details

Name:	PCMI_BusinessAcquisitionProFormaWeightedAverageNumberOfCommonSharesOutstandingDiluted
Namespace Prefix:	PCMI_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Acquisitions Pro Forma Operating Profit Loss.

+ References

No definition available.

+ Details

Name:	PCMI_BusinessAcquisitionsProFormaOperatingProfitLoss
Namespace Prefix:	PCMI_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=PCMI_EnPointeTechnologiesSalesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: