Legal Matters (Details) (Claim from public transit authority customer, USD $) In Millions, unless otherwise specified	1 Months Ended
Mar. 31, 2012	Nov. 30, 2011 item	Jun. 30, 2013 Maximum
Legal Matters
Number of former employees alleged for loss of revenue due to inappropriate and illegal actions		1
Period prior to acquisition of contract during which a former employee was committing illegal acts		2 years
Amount of recoupment sought under claim for alleged lost revenue, fees and damages		$ 3.9
Default judgment award amount	2.9
Accrued cost for contingency losses	$ 2.9		$ 2.9

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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

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-Name Accounting Standards Codification

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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