Annual report pursuant to Section 13 and 15(d)

Goodwill (Details)

v3.8.0.1
Goodwill (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Goodwill [Roll Forward]                          
Goodwill, beginning balance $ 327,836,000       $ 93,796,000       $ 53,014,000 $ 93,796,000 $ 53,014,000    
Adjustment to RMG goodwill                   (812,000)      
Goodwill related to acquisitions                   298,847,000 41,093,000    
Impairment loss   $ (64,000,000) $ 0 $ 0 0 $ 0 $ 0 $ 0 0 (64,000,000) 0 $ 0  
Foreign currency translation and other                   5,000 (311,000)    
Goodwill, ending balance   327,836,000       93,796,000       327,836,000 93,796,000 53,014,000  
Gross carrying amount                         $ 391,836,000
Accumulated impairment loss                         (64,000,000)
Goodwill, Net 327,836,000 327,836,000     93,796,000 93,796,000     53,014,000 93,796,000 53,014,000 53,014,000 327,836,000
Emerging Markets Communications LLC                          
Goodwill [Roll Forward]                          
Impairment loss                   (64,000,000)      
Aviation Connectivity                          
Goodwill [Roll Forward]                          
Goodwill, beginning balance 98,037,000       19,273,000       0 19,273,000 0    
Adjustment to RMG goodwill                   0      
Goodwill related to acquisitions                   78,764,000 19,298,000    
Impairment loss                   0      
Foreign currency translation and other                   0 (25,000)    
Goodwill, ending balance   98,037,000       19,273,000       98,037,000 19,273,000 0  
Gross carrying amount                         98,037,000
Accumulated impairment loss                         0
Goodwill, Net 98,037,000 98,037,000     19,273,000 19,273,000     0 19,273,000 0 0 98,037,000
Maritime & Land Connectivity                          
Goodwill [Roll Forward]                          
Goodwill, beginning balance 146,380,000       0       0 0 0    
Adjustment to RMG goodwill                   0      
Goodwill related to acquisitions                   210,380,000 0    
Impairment loss                   (64,000,000)      
Foreign currency translation and other                   0 0    
Goodwill, ending balance   146,380,000       0       146,380,000 0 0  
Gross carrying amount                         210,380,000
Accumulated impairment loss                         (64,000,000)
Goodwill, Net 146,380,000 146,380,000     0 0     0 0 0 0 146,380,000
Media & Content                          
Goodwill [Roll Forward]                          
Goodwill, beginning balance 83,419,000       74,523,000       53,014,000 74,523,000 53,014,000    
Adjustment to RMG goodwill                   (812,000)      
Goodwill related to acquisitions                   9,703,000 21,795,000    
Impairment loss                   0      
Foreign currency translation and other                   5,000 (286,000)    
Goodwill, ending balance   83,419,000       74,523,000       83,419,000 74,523,000 53,014,000  
Gross carrying amount                         83,419,000
Accumulated impairment loss                         0
Goodwill, Net 83,419,000 $ 83,419,000     $ 74,523,000 $ 74,523,000     $ 53,014,000 74,523,000 $ 53,014,000 $ 53,014,000 $ 83,419,000
ASU 2017-04 | Maritime & Land Connectivity                          
Goodwill [Roll Forward]                          
Impairment loss                   $ (91,100,000)      
Minimum | ASU 2017-04 | Subsequent Event | Maritime & Land Connectivity                          
Goodwill [Roll Forward]                          
Impairment loss (75,000,000)                        
Maximum | ASU 2017-04 | Subsequent Event | Maritime & Land Connectivity                          
Goodwill [Roll Forward]                          
Impairment loss $ (80,000,000)