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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Additions to goodwill, client lists and other intangible assets resulting from acquisitions and contingent consideration earned on prior period acquisitions    
Goodwill $ 217 $ 5,597
Client lists [Member]
    
Additions to goodwill, client lists and other intangible assets resulting from acquisitions and contingent consideration earned on prior period acquisitions    
Other intangible assets    5,603
Other intangible assets [Member]
    
Additions to goodwill, client lists and other intangible assets resulting from acquisitions and contingent consideration earned on prior period acquisitions    
Other intangible assets    $ 140