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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)