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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 486,383 $ 470,752
Less: Accumulated depreciation 116,612 96,092
Total 369,771 374,660
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 31,315 30,313
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 39,828 34,632
Plant and transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9,721 6,631
Cable-ships and submersibles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 253,652 251,840
Equipment, furniture and fixtures, and software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 143,056 127,409
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,811 $ 19,927