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Acquisitions (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 item | Mar. 31, 2012 item | Jun. 30, 2013 item
Acquisitions |  |  |
Number of acquisitions | 1 | 1 | 0

X
- Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration