Acquisitions (Details)	6 Months Ended	0 Months Ended
Jun. 30, 2014 stores	Jun. 30, 2013 stores	Jul. 10, 2014 Subsequent Event [Member] stores
Subsequent Event [Line Items]
Number of stores purchased	0	3	1

The number of businesses acquired by the entity during the period.

No definition available.

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration