Amount of debt hedged by interest rate derivatives.

No definition available.

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Namespace Prefix:	prxl_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Derivative interest rate cap arrangement.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	prxl_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Line of credit facility maximum interest rate per annum.

+ References

No definition available.

+ Details

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Namespace Prefix:	prxl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The average effective interest rate during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Lines Of Credit (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended		1 Months Ended								12 Months Ended						6 Months Ended		1 Months Ended				6 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2011	Sep. 30, 2011 2011 Credit Agreement [Member]	Dec. 31, 2011 2011 Credit Agreement [Member]	Jun. 30, 2011 2011 Credit Agreement [Member]	Sep. 30, 2010 2010 Credit Facility [Member]	Dec. 31, 2011 Revolving Credit Facility [Member]	Jun. 30, 2011 Revolving Credit Facility [Member]	Dec. 31, 2011 Term Loan [Member]	Jun. 30, 2011 Term Loan [Member]	Jun. 30, 2011 5% Interest Repaid By June 30, 2012 [Member]	Jun. 30, 2011 5% Interest Repaid During One-Year Period From July 1, 2012 To June 30, 2013 [Member]	Jun. 30, 2011 10% Interest Repaid During One-Year Period From July 1, 2013 To June 30, 2014 [Member]	Jun. 30, 2011 20% Interest Repaid During One-Year Period From July 1, 2014 To June 30, 2015 [Member]	Jun. 30, 2011 60% Interest Repaid During One-Year Period From July 1, 2015 To June 30,2016 [Member]	Dec. 31, 2011 JP Morgan UK [Member]	Dec. 31, 2010 JP Morgan [Member]	Sep. 30, 2010 JP Morgan [Member] 2010 Credit Facility [Member]	Dec. 31, 2010 Bank Of America [Member]	Sep. 30, 2010 Bank Of America [Member] 2010 Credit Facility [Member]	Sep. 30, 2010 KeyBank [Member] 2010 Credit Facility [Member]	Dec. 31, 2010 HSBC [Member]	Dec. 31, 2011 Maximum [Member] JP Morgan UK [Member]	Dec. 31, 2011 Minimum [Member] JP Morgan UK [Member]
Line of Credit Facility [Line Items]
Credit agreement maximum borrowing capacity							$ 75		$ 300		$ 100								$ 25		$ 25	$ 25	$ 25
Line of credit facility maximum interest rate per annum		1.75%
Line of credit facility amount outstanding						245.00		145.00		97.50
Principal amount available through revolving credit facility																	4.5
Line of credit facility, maturity date		June 30, 2016																June 30, 2011		June 30, 2011
Line of credit facility annual principal payment in percentage												5.00%	5.00%	10.00%	20.00%	60.00%
Max commitment fee on revolving loan unused amount, percentage		0.40%
Remaining borrowing available under revolving credit facility								155.0									4.5
Interest rate swap, fixed interest rate				1.30%
Derivative interest rate cap arrangement				2.00%
Principal amount of debt hedged with an interest rate swap agreement	75			100
Interest rate swap, average interest rate					2.00%
Interest rate on borrowing																								4.00%	2.00%
Gross overdraft balance related to pooling arrangement		$ 50.2	$ 46.9