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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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to Parsons Corporation	$ 9,039	$ 12,973
Convertible senior notes if-converted method interest adjustment	528
Diluted net income attributable to Parsons Corporation	$ 9,567	$ 12,973

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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