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Net Loss Attributable to ORBCOMM Inc. Common Stockholders - Summary of Basic and Diluted Calculations of EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net loss attributable to ORBCOMM Inc. common stockholders $ (10,086) $ (3,343)
Weighted average number of common shares outstanding:    
Basic number of common shares outstanding 74,729 71,424
Diluted number of common shares outstanding 74,729 71,424
Earnings per share:    
Basic $ (0.13) $ (0.05)
Diluted $ (0.13) $ (0.05)