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Discontinued Operations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 20, 2013 | Oct. 31, 2013 | Apr. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sale of bus business |  | $ 100,000 |
Proceeds from sale of bus business, net of cash sold |  | 97,677 |
Sale of bus business, cash sold |  | 2,323 |
Discontinued operation, amounts due from ASV | 6,006 |  |
Discontinued operation, total amounts due from ASV | 8,329 |  |
Pre-tax gain on sale of business |  | 7,825 |
Disposition of ambulance net assets |  |  | 12,051
Gain (loss) recognized on sale of assets |  |  | 0
Impact of indemnification to tax expenses |  | $ 1,883 |

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- Definition Disposition Of Ambulance Net Assets + References No definition available. + Details
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- Definition Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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