Related Party Transactions (Details) - Affiliated Entity - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| ZM EAC LLC |
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| Related Party Transaction [Line Items] |
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| Ownership interest percentage by noncontrolling owners |
33.60%
|
|
|
| Q&U Investments LLC |
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| Related Party Transaction [Line Items] |
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| Ownership interest percentage by noncontrolling owners |
20.90%
|
|
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| ZM EAC LLC and Q&U Investments LLC |
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| Related Party Transaction [Line Items] |
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| Cash received from related party |
|
$ 0.4
|
|
| ZM EAC LLC and Q&U Investments LLC | Subordinated Notes |
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| Related Party Transaction [Line Items] |
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| Prepayments of Debt |
$ 1.3
|
|
$ 26.7
|
| Interest expense |
|
|
$ 0.7
|
| Outstanding principal amount extinguished |
|
2.2
|
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| Gain on extinguishment of debt |
$ 0.8
|
|
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| ZM EAC LLC and Q&U Investments LLC | Cumulative Convertible Preferred Stock | Evergreen Helicopters Inc |
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| Related Party Transaction [Line Items] |
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| Issuance of Series A Preferred Stock |
|
|
1,984,680
|
| ZM EAC LLC and Q&U Investments LLC | Litigation related expenses and other costs |
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| Related Party Transaction [Line Items] |
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| Expenses and other costs |
|
$ 0.2
|
$ 0.5
|
| ZM EAC LLC and Q&U Investments LLC | Consulting and due diligence services |
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| Related Party Transaction [Line Items] |
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| Expenses and other costs |
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|
$ 2.5
|