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Earnings Per Share - Net Income Available to Shareholders to Compute Basic and Diluted EPS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to Parsons Corporation	$ 19,358	$ 40,658	$ 35,099	$ 76,930
Convertible senior notes if-converted method interest adjustment	534	1,164	1,593
Diluted net income attributable to Parsons Corporation	$ 19,892	$ 41,822	$ 36,692	$ 76,930

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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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