Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended					0 Months Ended		0 Months Ended	12 Months Ended			1 Months Ended					12 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Falcon 9 Agreement [Member] Satellite	Dec. 31, 2012 Falcon 9 Agreement [Member]	Sep. 21, 2012 Secondary Payload Launch Services Agreement [Member]	Dec. 31, 2013 Cellular Data Providers [Member]	May 05, 2008 Procurement Agreement [Member] SNC [Member]	Dec. 31, 2013 Procurement Agreement [Member] SNC [Member] Satellite	Aug. 31, 2010 Procurement Agreement [Member] SNC [Member] Agreement	Aug. 31, 2008 Procurement Agreement [Member] SNC [Member] Satellite	Aug. 28, 2009 Procurement Agreement [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Dec. 31, 2013 Procurement Agreement [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Dec. 31, 2012 Procurement Agreement [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Aug. 31, 2010 Procurement Agreement [Member] Engineering Changes [Member] SNC [Member]	Aug. 31, 2010 Procurement Agreement [Member] Launch Activities [Member] SNC [Member]	Dec. 31, 2013 Procurement Agreement [Member] Airtime [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Dec. 31, 2012 Procurement Agreement [Member] Airtime [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Dec. 31, 2011 Procurement Agreement [Member] Airtime [Member] Space Exploration Technologies Corp. (SpaceX) [Member]	Dec. 31, 2011 Procurement Agreement [Member] Airtime [Member] Space Exploration Technologies Corp. (SpaceX) [Member] Europe [Member]	May 05, 2008 Minimum [Member] Procurement Agreement [Member] SNC [Member]	May 05, 2008 Maximum [Member] Procurement Agreement [Member] SNC [Member] Satellite
Long-term Purchase Commitment [Line Items]
Total contract price under agreement					$ 42,600	$ 4,000		$ 117,000				$ 46,600
Delayed shipset																					60 days	120 days
Incentive payments								1,500
Number of satellites				17					8													30
Low-earth-orbit satellites											18
Cost reimbursable															317	4,110
Amount of credit available										1,528
Additional task order agreements										2
Milestone payments	58,500			35,145
Milestone payments during remainder	47,970			7,455
Credits provided																	31	32	31	3,736
Unused credits granted													2,097	2,128
Lease payment and rent expense	2,554	1,729	1,509
Future minimum payments for the year, 2014							2,429
Future minimum payments for the year, 2015							832
Future minimum payments for the year, 2016							339
Future minimum payments for the year, 2017							339
Future minimum payments for the year, 2018							$ 223