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Summary of Marketable Securities by Asset Type (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost $ 129,660 $ 105,483
Available-for-Sale Securities, Gross Unrealized Gains 14,645 8,644
Available-for-Sale Securities, Gross Unrealized Losses (1,425) (1,034)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 142,880 113,093
Equity securities
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 106,838 83,094
Available-for-Sale Securities, Gross Unrealized Gains 14,223 8,089
Available-for-Sale Securities, Gross Unrealized Losses (1,261) (891)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 119,800 90,292
Equity securities | Stocks | Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 984 1,090
Available-for-Sale Securities, Gross Unrealized Gains 669 244
Available-for-Sale Securities, Gross Unrealized Losses (20)  
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 1,633 1,334
Equity securities | Stocks | Domestic
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 31,071 24,492
Available-for-Sale Securities, Gross Unrealized Gains 8,965 5,265
Available-for-Sale Securities, Gross Unrealized Losses (132) (392)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 39,904 29,365
Equity securities | Mutual funds | Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 30,541 18,328
Available-for-Sale Securities, Gross Unrealized Gains 2,799 1,901
Available-for-Sale Securities, Gross Unrealized Losses   (7)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 33,340 20,222
Equity securities | Mutual funds | Domestic
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 44,242 39,184
Available-for-Sale Securities, Gross Unrealized Gains 1,790 679
Available-for-Sale Securities, Gross Unrealized Losses (1,109) (492)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 44,923 39,371
Fixed maturity
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 22,822 22,389
Available-for-Sale Securities, Gross Unrealized Gains 422 555
Available-for-Sale Securities, Gross Unrealized Losses (164) (143)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 23,080 22,801
Fixed maturity | U.S. Treasury and other government
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 21,156 20,528
Available-for-Sale Securities, Gross Unrealized Gains 152 247
Available-for-Sale Securities, Gross Unrealized Losses (164) (139)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 21,144 20,636
Fixed maturity | Corporate bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 1,544 1,724
Available-for-Sale Securities, Gross Unrealized Gains 212 244
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 1,756 1,968
Fixed maturity | Foreign bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 37 37
Available-for-Sale Securities, Gross Unrealized Gains 3 4
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 40 41
Fixed maturity | Mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 85 100
Available-for-Sale Securities, Gross Unrealized Gains 55 60
Available-for-Sale Securities, Gross Unrealized Losses   (4)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) $ 140 $ 156