v2.4.0.6

New Accounting Pronouncements (Details)	3 Months Ended
	Mar. 31, 2012 statement
New Accounting Pronouncements
Number of separate statements in which the entity is required to present comprehensive income	2

X

- Definition

Represents the number of statements presented by the entity to reflect the net income, total net income, components of other comprehensive income and total of other comprehensive income.

+ References

No definition available.

+ Details

Name:	penn_NewAccountingPronouncementOrChangeInAccountingPrincipleNumberOfSeparateStatements
Namespace Prefix:	penn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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