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Business Acquisitions and Investments, Pensacola Fuel Injection Inc Acquisition and Annex Manufacturing (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Pensacola Fuel Injection Inc. [Member] | Sep. 30, 2014 Annex Manufacturing [Member] | Sep. 30, 2014 Annex Manufacturing [Member] | Dec. 31, 2013 Annex Manufacturing [Member] | Sep. 30, 2014 Annex Manufacturing [Member] Customer Relationships [Member] | Sep. 30, 2014 Annex Manufacturing [Member] Non-compete Agreements [Member]
Allocation of purchase price to the assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  | $ 12,225,000 |  | $ 11,500,000 |  |  |
Assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  | 0 | 2,581,000 | 2,581,000 |  |  |
Inventory |  |  |  |  |  | 2,815,000 | 2,630,000 | 2,630,000 |  |  |
Property, plant and equipment, net |  |  |  |  |  | 466,000 | 128,000 | 128,000 |  |  |
Intangible assets |  |  |  |  |  | 0 | 4,760,000 | 4,760,000 |  |  |
Goodwill | 55,068,000 |  | 55,068,000 |  | 38,005,000 | 12,528,000 | 4,567,000 | 4,567,000 |  |  |
Current liabilities |  |  |  |  |  | (3,584,000) | (3,166,000) | (3,166,000) |  |  |
Net assets acquired |  |  |  |  |  | 12,225,000 | 11,500,000 | 11,500,000 |  |  |
Revenue reported by acquired entity for last annual period |  |  |  |  |  |  |  |  | 22,000,000 |  |
Percentage of volume from acquired business sold to parent (in hundredths) |  |  |  |  |  |  |  |  | 40.00% |  |
Intangible assets acquired in business acquisition |  |  |  |  |  |  |  |  |  | 4,700,000 | 100,000
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  | 7 years | 5 years
Revenues | $ 257,046,000 | $ 264,162,000 | $ 762,338,000 | $ 764,996,000 |  |  | $ 6,000,000 |  |  |  |

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