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Goodwill and Intangible Assets (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 | May 31, 2014 | May 31, 2014 | May 31, 2013 ReportingUnit | May 31, 2012 | Dec. 31, 2013 | May 31, 2014 Maximum [Member] | May 31, 2014 Minimum [Member] | May 22, 2012 Navilyst [Member] | May 31, 2014 Navilyst [Member] | May 22, 2012 Navilyst [Member] Trademark-NAMIC [Member] | May 31, 2014 Navilyst [Member] Trademark-NAMIC [Member] | May 31, 2013 Income Approach Valuation Technique [Member] | May 31, 2013 Market Approach Valuation Technique [Member]
Goodwill and Intangible Assets (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimates useful life of intangible assets other than goodwill |  |  |  |  |  |  | 20 years | 3 years | 10 years |  |  |  |  |
Acquired intangible asset |  |  |  |  |  |  |  |  |  |  | $ 28,600,000 | $ 28,600,000 |  |
Number of reporting segments |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Weight assigned to valuation methods |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 25.00%
Terminal value of the reporting unit |  | 7.0 | 7.0 |  |  |  |  |  |  |  |  |  |  |
Discount rate used in fair value calculation |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value, carrying value |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
Goodwill impairment | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in carrying value of goodwill related to working capital |  | 500,000 |  |  |  |  |  |  |  | (2,257,000) |  |  |  |
Reduction in carrying value of goodwill |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |
Change in carrying value of goodwill due to settlement |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |
Increase in value of deferred tax assets |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |
Preacquisition tax adjustments to goodwill |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  | $ 16,797,000 | $ 16,345,000 | $ 9,406,000 |  |  |  |  |  |  |  |  |

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- Definition Change in carrying value of goodwill due to settlement with previous owner. + References No definition available. + Details
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- Definition Change in carrying value of goodwill resulting from increase in value of the deferred tax assets assumed in acquisition. + References No definition available. + Details
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- Definition Fair Value Assumptions, Calculation Weighted Applied to Various Valuation Method + References No definition available. + Details
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- Details
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- Definition Percentage of fair value exceeding its carrying value. + References No definition available. + Details
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- Definition Preacquisition tax adjustments to goodwill. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
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