Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 05, 2011
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Entity Registrant Name	PINNACLE ENTERTAINMENT INC.
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000356213
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		62,043,727