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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Fair value information related to assets  
Assets $ 1,968
Other mutual funds [Member]
 
Fair value information related to assets  
Assets 1,289
Money market funds [Member]
 
Fair value information related to assets  
Assets 679
Quoted Prices in Active Markets (Level 1) [Member]
 
Fair value information related to assets  
Assets 1,968
Quoted Prices in Active Markets (Level 1) [Member] | Other mutual funds [Member]
 
Fair value information related to assets  
Assets 1,289
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
 
Fair value information related to assets  
Assets 679
Significant Other Observable Inputs (Level 2) [Member]
 
Fair value information related to assets  
Assets   
Significant Other Observable Inputs (Level 2) [Member] | Other mutual funds [Member]
 
Fair value information related to assets  
Assets   
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
 
Fair value information related to assets  
Assets   
Significant Unobserved Inputs (Level 3) [Member]
 
Fair value information related to assets  
Assets   
Significant Unobserved Inputs (Level 3) [Member] | Other mutual funds [Member]
 
Fair value information related to assets  
Assets   
Significant Unobserved Inputs (Level 3) [Member] | Money market funds [Member]
 
Fair value information related to assets  
Assets