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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | Nov. 30, 2015 | May. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 150,581 | $ 149,864
Available-for-Sale Securities, Gross Unrealized Gains | 5,723 | 8,721
Available-for-Sale Securities, Gross Unrealized Losses | (7,889) | (3,815)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 148,415 | 154,770
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 127,781 | 127,189
Available-for-Sale Securities, Gross Unrealized Gains | 5,478 | 8,330
Available-for-Sale Securities, Gross Unrealized Losses | (7,631) | (3,653)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 125,628 | 131,866
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 4,282 | 3,722
Available-for-Sale Securities, Gross Unrealized Gains | 415 | 339
Available-for-Sale Securities, Gross Unrealized Losses | (248) | (85)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 4,449 | 3,976
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 32,032 | 34,368
Available-for-Sale Securities, Gross Unrealized Gains | 3,991 | 5,649
Available-for-Sale Securities, Gross Unrealized Losses | (955) | (559)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 35,068 | 39,458
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 33,605 | 32,657
Available-for-Sale Securities, Gross Unrealized Gains | 948 | 2,114
Available-for-Sale Securities, Gross Unrealized Losses | (2,398) | (230)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 32,155 | 34,541
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 57,862 | 56,442
Available-for-Sale Securities, Gross Unrealized Gains | 124 | 228
Available-for-Sale Securities, Gross Unrealized Losses | (4,030) | (2,779)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 53,956 | 53,891
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 22,800 | 22,675
Available-for-Sale Securities, Gross Unrealized Gains | 245 | 391
Available-for-Sale Securities, Gross Unrealized Losses | (258) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 22,787 | 22,904
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 21,714 | 21,340
Available-for-Sale Securities, Gross Unrealized Gains | 85 | 171
Available-for-Sale Securities, Gross Unrealized Losses | (258) | (162)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,541 | 21,349
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 36 | 36
Available-for-Sale Securities, Gross Unrealized Gains | 2 | 2
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 38 | 38
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 18 | 81
Available-for-Sale Securities, Gross Unrealized Gains | 23 | 47
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 41 | 128
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,032 | 1,218
Available-for-Sale Securities, Gross Unrealized Gains | 135 | 171
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 1,167 | $ 1,389

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