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Commitments and Contingencies (Tables)
 12 Months Ended
May 31, 2014
Commitments And Contingencies Disclosure [Abstract]  
Amounts of Obligations from Repurchased Units and Incurred Net Losses for Periods

The amounts of obligations from repurchased units and incurred net losses for the periods presented are as follows:

 

     Year ended May 31,  
     2014      2013  
     (Dollars in thousands)  

Number of units repurchased

      —         3   

Obligations from units repurchased

    $ —       $ 31   

Net losses on repurchased units

    $ —       $ —