Acquisitions - Summary of Pro Forma Results of Operation (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Net revenues	$ 46,084	$ 23,126	$ 133,297	$ 66,774
SkyWave Mobile Communications Inc. [Member]
Business Acquisition [Line Items]
Net revenues		39,011		112,568
Net income attributable to common shareholders		$ 6,245		$ 3,599
Earnings per share:
Basic		$ 0.09		$ 0.05
Diluted		$ 0.09		$ 0.05

Business acquisitions pro forma net income loss attributable to common stockholders.

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