Commitments and Contingencies - Additional Information (Detail)									1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 14, 2015 USD ($)	Jun. 30, 2015 USD ($)	Apr. 13, 2015 USD ($)	Jul. 14, 2014 Satellite	Dec. 21, 2012 USD ($)	Sep. 21, 2012 USD ($)	Aug. 23, 2011 USD ($) Satellite	May. 05, 2008 USD ($)	Apr. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) Satellite	Jun. 30, 2015 USD ($) Satellite	Jun. 30, 2014 USD ($)	Dec. 31, 2011 USD ($)	Apr. 18, 2014 USD ($)	Mar. 20, 2014 USD ($)	Aug. 31, 2010 USD ($) Satellite Agreement
Long-term Purchase Commitment [Line Items]
Non-cash impairment charge										$ (12,748,000)		$ (12,748,000)
First Amendment [Member]
Long-term Purchase Commitment [Line Items]
Procurement agreement contract price excluding optional satellites							$ 117,000,000
Second Amendment [Member]
Long-term Purchase Commitment [Line Items]
Procurement agreement contract price excluding optional satellites																$ 117,000,000
Falcon 9 Agreement [Member]
Long-term Purchase Commitment [Line Items]
Contract price			$ 42,600,000		$ 42,600,000	$ 4,000,000
Number of satellites | Satellite											17
Milestone payments		$ 5,325,000
Potential future milestone payments												$ 1,065,000
Contract original price						$ 46,600,000
OG2 Satellite Procurement [Member]
Long-term Purchase Commitment [Line Items]
Number of satellites | Satellite				6
Procurement Agreement Five Additional Task Order [Member]
Long-term Purchase Commitment [Line Items]
Procurement agreement fixed price contract amount															$ 2,700,000
Launch Plus One Year In Orbit Insurance Coverage for First Launch of Six Satellites [Member]
Long-term Purchase Commitment [Line Items]
Insurance coverage on launch of satellite program									$ 66,000,000
Launch Vehicle Flight Only Insurance Coverage for First Launch of Six Satellites [Member]
Long-term Purchase Commitment [Line Items]
Insurance coverage on launch of satellite program									22,000,000
First Launch of Six Satellites [Member]
Long-term Purchase Commitment [Line Items]
Premium cost for launch of satellite									9,953,000
Launch Plus One Year In Orbit Insurance Coverage for Second Launch of Eleven Satellites [Member]
Long-term Purchase Commitment [Line Items]
Insurance coverage on launch of satellite program									120,000,000
Launch Vehicle Flight Only Insurance Coverage for Second Launch of Eleven Satellites [Member]
Long-term Purchase Commitment [Line Items]
Insurance coverage on launch of satellite program									22,000,000
Second Launch of Eleven Satellites [Member]
Long-term Purchase Commitment [Line Items]
Premium cost for launch of satellite									$ 16,454,000
Percentage of premium as to aggregate premium									5.00%
In-orbit OG2 Satellites One [Member]
Long-term Purchase Commitment [Line Items]
Non-cash impairment charge										12,748,000
Removal/decrease in satellite network and other equipment										13,788,000
Accumulated depreciation on equipment										1,040,000
Subsequent Event [Member] | Launch Plus One Year In-orbit Insurance Coverage for Five Satellites [Member]
Long-term Purchase Commitment [Line Items]
Insurance coverage on launch of satellite program	$ 40,000,000
Procurement Agreement [Member] | SNC [Member]
Long-term Purchase Commitment [Line Items]
Incentive payments								$ 1,500,000
Number of satellites | Satellite												8
LEO satellites | Satellite																	18
Amount of credit available																	$ 1,528,000
Additional task order agreements | Agreement																	2
Liquidated delay damages								3,900,000
Milestone payments		7,928,000
Potential future milestone payments												$ 29,512,000
Procurement Agreement [Member] | Space Exploration Technologies Corp. (SpaceX) [Member]
Long-term Purchase Commitment [Line Items]
Unused credits granted		$ 2,053,000								2,053,000	$ 2,082,000	2,053,000	$ 2,082,000
Procurement Agreement [Member] | Launch Activities [Member] | SNC [Member]
Long-term Purchase Commitment [Line Items]
Cost reimbursable																	$ 4,110,000
Procurement Agreement [Member] | Engineering Changes [Member] | SNC [Member]
Long-term Purchase Commitment [Line Items]
Cost reimbursable																	$ 317,000
Procurement Agreement [Member] | Airtime [Member] | Space Exploration Technologies Corp. (SpaceX) [Member]
Long-term Purchase Commitment [Line Items]
Credits provided										$ 7,000	$ 7,000	$ 15,000	$ 15,000
Procurement Agreement [Member] | Airtime [Member] | Space Exploration Technologies Corp. (SpaceX) [Member] | Europe [Member]
Long-term Purchase Commitment [Line Items]
Credits provided														$ 3,736,000
Maximum [Member] | Procurement Agreement [Member] | SNC [Member]
Long-term Purchase Commitment [Line Items]
Contract price								$ 117,000,000
Delayed shipset								120 days
Number of satellites | Satellite							30
Minimum [Member] | Procurement Agreement [Member] | SNC [Member]
Long-term Purchase Commitment [Line Items]
Delayed shipset								60 days