Agreement and Plan of Merger with Central Parking Corporation (Details) (KCPC)	1 Months Ended
Feb. 28, 2012	Sep. 30, 2012 Minimum parkingfacility
Agreement and Plan of Merger
Shares of common stock to be issued to KCPC Stockholders	6,161,334
Number of off-street parking facilities covered under the contracts to be divested		100

Number of shares of equity interests issued or issuable to acquire entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration