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Commitments and Contingencies - Amounts of Obligations from Repurchased Units, Discontinued Operations and Incurred Net Losses for Periods (Detail) - 12 months ended May. 31, 2015
$ in Thousands
USD ($)
Unit
Commitments and Contingencies Disclosure [Abstract]  
Number of units repurchased | Unit 42
Obligations from units repurchased $ 689
Net losses on repurchased units $ 177