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Organization and Business - Narrative (Details) - segment | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016
Business And Organization [Line Items] |  |
Number of reportable segments | 7 |
DMi Inc. | Other |  |
Business And Organization [Line Items] |  |
Percentage of ownership | 56.00% |
NerVve Technologies Inc. | Other |  |
Business And Organization [Line Items] |  |
Percentage of ownership | 72.00% |
Construction |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 92.00% |
Marine Services |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 95.00% |
Insurance Companies |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 100.00% | 100.00%
Energy |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 49.99% |
PTGI-ICS |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 100.00% | 100.00%
Genoval Orthopedics inc. |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 77.00% |
GemDerm Aesthetics, Inc |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 67.00% |
Benevir Biopharm, Inc. |  |
Business And Organization [Line Items] |  |
Parents controlling interest (as a percent) | 80.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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