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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) service_provider | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016
Significant Accounting Policies [Line Items] |  |  |  |
Dividend yield | 0.00% | 0.00% | 0.00% |
Impact of adjustments | $ (97,431) | $ (35,762) | $ (11,832) |
Buildings and Improvements | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 5 years |  |  |
Buildings and Improvements | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 40 years |  |  |
Cable-ships and submersibles |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 35 years |  |  |
Machinery and Equipment | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 3 years |  |  |
Machinery and Equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 15 years |  |  |
Plant and Motor Vehicles | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 3 years |  |  |
Plant and Motor Vehicles | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of property, plant and equipment | 20 years |  |  |
Marine Services |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of telecommunications providers through contracts under maintenance (up to) | service_provider | 60 |  |  |
Marine Services | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maintenance contract term | 5 years |  |  |
Fixed price contracts installation term | 1 month |  |  |
Marine Services | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maintenance contract term | 7 years |  |  |
Fixed price contracts installation term | 5 months |  |  |
Insurance Companies |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 100.00% |  |  | 100.00%
PTGI-ICS |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 100.00% |  |  | 100.00%
Marine Services |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 95.00% |  |  |
Construction |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 92.00% |  |  |
Dmi Incorporation |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 56.00% |  |  |
NerVve Technologies Inc. |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 72.00% |  |  |
Energy |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 49.99% |  |  |
Genoval Orthopedics inc. |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 77.00% |  |  |
GemDerm Aesthetics, Inc |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 67.00% |  |  |
Benevir Biopharm, Inc. |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ownership interest owned | 80.00% |  |  |
Error in Accounting for Certain Items Related to Purchase Accounting |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adjustments | $ 800 | $ 700 | (200) |
Adjustment amount | $ 1,300 |  |  |
Accounting Standards Update 2015-03 | Other Noncurrent Assets |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred financing costs reclassified from other assets |  |  | $ (7,800) |

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