Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	May. 31, 2013	Dec. 31, 2015	Apr. 03, 2015
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Total U.S. government contract-related reserves balance		$ 2.9	$ 4.3
Satellite - ViaSat-2 [Member] | Capital Addition [Member]
Loss Contingencies [Line Items]
Purchase price under agreement	$ 358.0