Net Income (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, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss attributable to ORBCOMM Inc. common stockholders	$ (5,490)	$ (10,086)
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	79,387	74,729
Diluted number of common shares outstanding	79,387	74,729
Earnings per share:
Basic	$ (0.07)	$ (0.13)
Diluted	$ (0.07)	$ (0.13)

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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