CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,161us-gaap_NetIncomeLoss	$ 5,205us-gaap_NetIncomeLoss
Loss from discontinued operations, net of taxes	226	65
Net income from continuing operations	1,387	5,270
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,572us-gaap_Depreciation	8,666us-gaap_Depreciation
Amortization	4,050us-gaap_AmortizationOfIntangibleAssets	2,483us-gaap_AmortizationOfIntangibleAssets
Amortization of debt issuance costs	182us-gaap_AmortizationOfFinancingCosts	161us-gaap_AmortizationOfFinancingCosts
Payments for legal settlements and related expenses	(70)us-gaap_PaymentsForLegalSettlements	0us-gaap_PaymentsForLegalSettlements
Deferred income taxes	94us-gaap_DeferredIncomeTaxExpenseBenefit	(22)us-gaap_DeferredIncomeTaxExpenseBenefit
Restructuring costs	4,183us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Payments for restructuring costs	(1,528)us-gaap_PaymentsForRestructuring	(1,347)us-gaap_PaymentsForRestructuring
Asset impairments	23us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Equity-based compensation	2,972us-gaap_ShareBasedCompensation	2,227us-gaap_ShareBasedCompensation
Excess tax benefits from share-based payment arrangements	(78)	(250)
Provision for doubtful accounts	250us-gaap_ProvisionForDoubtfulAccounts	229us-gaap_ProvisionForDoubtfulAccounts
Acquisition-related costs	573	1,905
Cash paid for acquisition-related costs	(1,591)pgi_PaymentsofAcquisitionRelatedCosts	(1,447)pgi_PaymentsofAcquisitionRelatedCosts
Changes in working capital, net of business acquisitions	(7,596)	(3,746)
Net cash provided by operating activities from continuing operations	11,423	14,129
Net cash used in operating activities from discontinued operations	(287)	(42)
Net cash provided by operating activities	11,136	14,087
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(10,776)	(8,101)
Business acquisitions, net of cash acquired	(16,019)	0
Other investing activities, net	(147)	2,050
Net cash used in investing activities from continuing operations	(26,942)	(6,051)
Net cash provided by (used in) investing activities from discontinued operations	0	0
Net cash used in investing activities	(26,942)	(6,051)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments under borrowing arrangements	(20,810)	(34,530)
Proceeds from borrowing arrangements	42,500us-gaap_ProceedsFromRepaymentsOfDebt	20,000us-gaap_ProceedsFromRepaymentsOfDebt
Payment of earn-out liability	(1,871)	0
Excess tax benefits of share-based payment arrangements	78	250
Purchase and retirement of treasury stock, at cost	(14,584)	(2,245)
Exercise of stock options	0	53
Net cash provided by (used in) financing activities from continuing operations	5,313	(16,472)
Net cash provided by (used in) financing activities from discontinued operations	0	0
Net cash provided by (used in) financing activities	5,313	(16,472)
Effect of exchange rate changes on cash and equivalents	(1,654)	202
NET DECREASE IN CASH AND EQUIVALENTS	(12,147)	(8,234)
CASH AND EQUIVALENTS, beginning of period	40,220	44,955
CASH AND EQUIVALENTS, end of period	$ 28,073	$ 36,721

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Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

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

- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

+ Details

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

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

+ Details

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

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

+ Details

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

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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

- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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Period Type:	duration

- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

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Period Type:	duration

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.P.3)

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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