Property and Equipment - Additional Information (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($) satellite	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) satellite	Jun. 30, 2017 USD ($)
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense on property and equipment	$ 68,760,000	$ 61,421,000	$ 135,110,000	$ 126,597,000
Disposal of property and equipment			0	14,760,000
Capitalized interest costs	$ 2,901,000	$ 1,005,000	$ 5,155,000	$ 1,723,000
Number of owned satellites \| satellite	5		5

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration