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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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