Acquisitions - Summary of Pro Forma Results of Operation (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Net revenues	$ 44,883	$ 24,298	$ 87,213	$ 43,648
SkyWave Mobile Communications Inc. [Member]
Business Acquisition [Line Items]
Net revenues		39,897		73,557
Net income (loss) attributable to common shareholders		$ 349		$ (2,665)
Earnings per share:
Basic		$ 0.01		$ (0.04)
Diluted		$ 0.01		$ (0.04)