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Information Regarding Change in Carrying Value of Non-Controlling Interest (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Nov. 30, 2014
Noncontrolling Interest [Line Items]  
Carrying value of non-controlling interest at May 31, 2014 $ 5,678us-gaap_MinorityInterest
Income attributable to non-controlling interest 216us-gaap_IncomeLossAttributableToNoncontrollingInterest
Other comprehensive loss attributable to non-controlling interest (37)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Carrying value of non-controlling interest at November 30, 2014 $ 5,857us-gaap_MinorityInterest