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Summary of Marketable Securities by Asset Type (Detail) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost $ 149,864 $ 129,660
Available-for-Sale Securities, Gross Unrealized Gains 8,721 14,645
Available-for-Sale Securities, Gross Unrealized Losses (3,815) (1,425)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 154,770 142,880
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 127,189 106,838
Available-for-Sale Securities, Gross Unrealized Gains 8,330 14,223
Available-for-Sale Securities, Gross Unrealized Losses (3,653) (1,261)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 131,866 119,800
Equity securities | Stocks | Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 3,722 984
Available-for-Sale Securities, Gross Unrealized Gains 339 669
Available-for-Sale Securities, Gross Unrealized Losses (85) (20)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 3,976 1,633
Equity securities | Stocks | Domestic    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 34,368 31,071
Available-for-Sale Securities, Gross Unrealized Gains 5,649 8,965
Available-for-Sale Securities, Gross Unrealized Losses (559) (132)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 39,458 39,904
Equity securities | Mutual funds | Foreign    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 32,657 30,541
Available-for-Sale Securities, Gross Unrealized Gains 2,114 2,799
Available-for-Sale Securities, Gross Unrealized Losses (230)  
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 34,541 33,340
Equity securities | Mutual funds | Domestic    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 56,442 44,242
Available-for-Sale Securities, Gross Unrealized Gains 228 1,790
Available-for-Sale Securities, Gross Unrealized Losses (2,779) (1,109)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 53,891 44,923
Fixed maturity    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 22,675 22,822
Available-for-Sale Securities, Gross Unrealized Gains 391 422
Available-for-Sale Securities, Gross Unrealized Losses (162) (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 22,904 23,080
Fixed maturity | U.S. Treasury and other government    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 21,340 21,156
Available-for-Sale Securities, Gross Unrealized Gains 171 152
Available-for-Sale Securities, Gross Unrealized Losses (162) (164)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 21,349 21,144
Fixed maturity | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 1,218 1,544
Available-for-Sale Securities, Gross Unrealized Gains 171 212
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 1,389 1,756
Fixed maturity | Foreign bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 36 37
Available-for-Sale Securities, Gross Unrealized Gains 2 3
Available-for-Sale Securities, Fair Value (Net Carrying Amount) 38 40
Fixed maturity | Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale Securities, Amortized Cost 81 85
Available-for-Sale Securities, Gross Unrealized Gains 47 55
Available-for-Sale Securities, Fair Value (Net Carrying Amount) $ 128 $ 140