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Summary of Marketable Securities by Asset Type (Detail) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | May 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 123,680 | $ 117,732
Available-for-Sale Securities, Gross Unrealized Gains | 4,263 | 5,475
Available-for-Sale Securities, Gross Unrealized Losses | (986) | (3,078)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 126,957 | 120,129
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 86,716 | 82,131
Available-for-Sale Securities, Gross Unrealized Gains | 3,443 | 4,490
Available-for-Sale Securities, Gross Unrealized Losses | (968) | (3,059)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 89,191 | 83,562
Equity securities | Stocks | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,321 | 1,016
Available-for-Sale Securities, Gross Unrealized Gains | 234 | 79
Available-for-Sale Securities, Gross Unrealized Losses | (1) |
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 1,554 | 1,095
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 26,657 | 24,380
Available-for-Sale Securities, Gross Unrealized Gains | 1,877 | 2,776
Available-for-Sale Securities, Gross Unrealized Losses | (922) | (1,046)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 27,612 | 26,110
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 19,053 | 17,489
Available-for-Sale Securities, Gross Unrealized Gains | 1,167 | 521
Available-for-Sale Securities, Gross Unrealized Losses | (5) | (936)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 20,215 | 17,074
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 39,685 | 39,246
Available-for-Sale Securities, Gross Unrealized Gains | 165 | 1,114
Available-for-Sale Securities, Gross Unrealized Losses | (40) | (1,077)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 39,810 | 39,283
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 36,964 | 35,601
Available-for-Sale Securities, Gross Unrealized Gains | 820 | 985
Available-for-Sale Securities, Gross Unrealized Losses | (18) | (19)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 37,766 | 36,567
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 20,641 | 19,347
Available-for-Sale Securities, Gross Unrealized Gains | 484 | 530
Available-for-Sale Securities, Gross Unrealized Losses | (17) | (12)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 21,108 | 19,865
Fixed maturity | Kemrock convertible bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 14,273 | 13,670
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 14,273 | 13,670
Fixed maturity | Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 1,832 | 2,305
Available-for-Sale Securities, Gross Unrealized Gains | 268 | 349
Available-for-Sale Securities, Gross Unrealized Losses |  | (5)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 2,100 | 2,649
Fixed maturity | Foreign bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 38 | 38
Available-for-Sale Securities, Gross Unrealized Gains | 3 | 1
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 41 | 39
Fixed maturity | Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 180 | 241
Available-for-Sale Securities, Gross Unrealized Gains | 65 | 105
Available-for-Sale Securities, Gross Unrealized Losses | (1) | (2)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 244 | $ 344

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