Goodwill and Intangible Assets (Reportable Segments) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Aug. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 11,810	$ 13,036
Goodwill recorded in connection with business combinations			242
Goodwill disposed in connection with business divestiture		0	(1,422)
Goodwill recorded in connection with business combinations		2,146
Foreign currency translation		(133)	(46)
Goodwill, ending balance		13,823	11,810
Recovery Audit Services - Americas [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		10,755	12,177
Goodwill recorded in connection with business combinations			0
Goodwill disposed in connection with business divestiture	$ (1,422)	0
Goodwill recorded in connection with business combinations		0
Foreign currency translation		0	0
Goodwill, ending balance		10,755	10,755
Recovery Audit Services - Europe/Asia-Pacific [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		813	859
Goodwill recorded in connection with business combinations			0
Goodwill disposed in connection with business divestiture		0	0
Goodwill recorded in connection with business combinations		0
Foreign currency translation		(133)	(46)
Goodwill, ending balance		680	813
Adjacent Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		242	0
Goodwill recorded in connection with business combinations			242
Goodwill disposed in connection with business divestiture		0	0
Goodwill recorded in connection with business combinations		2,146
Foreign currency translation		0	0
Goodwill, ending balance		$ 2,388	$ 242

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

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

- Definition

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=prgx_RecoveryAuditServicesAmericasSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=prgx_RecoveryAuditServicesEuropeAsiaPacificSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=prgx_AdjacentServicesSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: