Parsons (PSN) 10-Q 2 Nov 22 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 26, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Trading Symbol	PSN
Entity Registrant Name	Parsons Corporation
Entity Central Index Key	0000275880
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		103,502,919
Entity File Number	001-07782
Entity Tax Identification Number	95-3232481
Entity Address, Address Line One	5875 Trinity Parkway #300
Entity Address, City or Town	Centreville
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20120
City Area Code	703
Local Phone Number	988-8500
Title of 12(b) Security	Common Stock, $1 par value
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents (including $62,544 and $78,514 Cash of consolidated joint ventures)	$ 147,539	$ 342,608
Restricted cash and investments		1,275
Accounts receivable, net (including $187,482 and $140,266 Accounts receivable of consolidated joint ventures, net)	710,721	598,311
Contract assets (including $11,665 and $8,779 Contract assets of consolidated joint ventures)	642,264	579,216
Prepaid expenses and other current assets (including $6,870 and $18,783 Prepaid expenses and other current assets of consolidated joint ventures)	110,274	110,941
Total current assets	1,610,798	1,632,351
Property and equipment, net (including $1,987 and $1,721 Property and equipment of consolidated joint ventures, net)	94,518	104,196
Right of use assets, operating leases	161,602	182,672
Goodwill	1,661,107	1,412,690
Investments in and advances to unconsolidated joint ventures	99,424	110,688
Intangible assets, net	273,442	207,821
Deferred tax assets	139,890	134,393
Other noncurrent assets	54,209	46,129
Total assets	4,094,990	3,830,940
Current liabilities:
Accounts payable (including $61,545 and $78,558 Accounts payable of consolidated joint ventures)	200,847	196,286
Accrued expenses and other current liabilities (including $83,831 and $82,746 Accrued expenses and other current liabilities of consolidated joint ventures)	682,677	599,089
Contract liabilities (including $18,376 and $14,333 Contract liabilities of consolidated joint ventures)	197,749	171,671
Short-term lease liabilities, operating leases	59,056	55,902
Income taxes payable	9,150	7,836
Total current liabilities	1,149,479	1,030,784
Long-term employee incentives	15,637	15,997
Long-term debt	694,718	591,922
Long-term lease liabilities, operating leases	121,172	148,893
Deferred tax liabilities	10,409	11,400
Other long-term liabilities	98,483	94,832
Total liabilities	2,089,898	1,893,828
Contingencies (Note 12)
Shareholders' equity:
Common stock, $1 par value; authorized 1,000,000,000 shares; 146,087,771 and 146,276,880 shares issued; 39,326,392 and 33,331,494 public shares outstanding; 64,144,230 and 70,328,237 ESOP shares outstanding	146,088	146,277
Treasury stock, 42,617,149 shares at cost	(867,391)	(867,391)
Additional paid-in capital	2,678,653	2,684,979
Retained earnings (accumulated deficit)	15,008	(53,529)
Accumulated other comprehensive loss	(19,292)	(9,568)
Total Parsons Corporation shareholders' equity	1,953,066	1,900,768
Noncontrolling interests	52,026	36,344
Total shareholders' equity	2,005,092	1,937,112
Total liabilities and shareholders' equity	$ 4,094,990	$ 3,830,940

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Cash and cash equivalents	$ 147,539	$ 342,608
Accounts receivable, net	710,721	598,311
Contract assets	642,264	579,216
Prepaid expenses and other current assets	110,274	110,941
Property and equipment, net	94,518	104,196
Accounts payable	200,847	196,286
Accrued expenses and other current liabilities	682,677	599,089
Contract liabilities	$ 197,749	$ 171,671
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares, issued	146,087,771	146,276,880
Common stock, shares, outstanding	39,326,392	33,331,494
Treasury stock, shares	42,617,149	42,617,149
ESOP
Common stock, shares, outstanding	64,144,230	70,328,237
Consolidated Joint Ventures
Cash and cash equivalents	$ 62,544	$ 78,514
Accounts receivable, net	187,482	140,266
Contract assets	11,665	8,779
Prepaid expenses and other current assets	6,870	18,783
Property and equipment, net	1,987	1,721
Accounts payable	61,545	78,558
Accrued expenses and other current liabilities	83,831	82,746
Contract liabilities	$ 18,376	$ 14,333

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Direct cost of contracts	872,423	734,652	2,388,095	2,084,062
Equity in earnings of unconsolidated joint ventures	(974)	9,570	10,237	26,528
Selling, general and administrative expenses	196,960	191,231	581,969	566,991
Operating income	64,013	39,737	132,333	85,578
Interest income	382	65	618	315
Interest expense	(6,323)	(4,052)	(14,786)	(13,503)
Other income (expense), net	(685)	184	(304)	(1,202)
Total other income (expense)	(6,626)	(3,803)	(14,472)	(14,390)
Income before income tax expense	57,387	35,934	117,861	71,188
Income tax expense	(13,792)	(9,165)	(27,643)	(18,378)
Net income including noncontrolling interests	43,595	26,769	90,218	52,810
Net income attributable to noncontrolling interests	(14,024)	(7,411)	(21,685)	(17,711)
Net income attributable to Parsons Corporation	$ 29,571	$ 19,358	$ 68,533	$ 35,099
Earnings per share:
Basic	$ 0.29	$ 0.19	$ 0.66	$ 0.34
Diluted	$ 0.27	$ 0.18	$ 0.62	$ 0.33

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 43,595	$ 26,769	$ 90,218	$ 52,810
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of tax	(7,134)	(4,205)	(9,643)	3,721
Pension adjustments, net of tax	(68)	(26)	(93)	12
Comprehensive income including noncontrolling interests, net of tax	36,393	22,538	80,482	56,543
Comprehensive income attributable to noncontrolling interests, net of tax	(14,014)	(7,407)	(21,673)	(17,711)
Comprehensive income attributable to Parsons Corporation, net of tax	$ 22,379	$ 15,131	$ 58,809	$ 38,832

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income including noncontrolling interests	$ 90,218	$ 52,810
Adjustments to reconcile net income to net cash used in operating activities
Depreciation and amortization	90,668	106,540
Amortization of debt issue costs	1,959	2,173
(Gain) loss on disposal of property and equipment	(261)	357
Provision for doubtful accounts	(3)	8
Deferred taxes	(6,334)	(4,369)
Foreign currency transaction gains and losses	3,502	3,107
Equity in earnings of unconsolidated joint ventures	(10,237)	(26,528)
Return on investments in unconsolidated joint ventures	25,626	20,547
Stock-based compensation	14,991	15,544
Contributions of treasury stock	41,980	41,312
Changes in assets and liabilities, net of acquisitions and newly consolidated joint ventures:
Accounts receivable	(90,913)	70,355
Contract assets	(62,861)	13,262
Prepaid expenses and other assets	8,772	(19,596)
Accounts payable	(918)	(39,341)
Accrued expenses and other current liabilities	20,220	(86,402)
Contract liabilities	26,665	(16,294)
Income taxes	1,160	(498)
Other long-term liabilities	(5,866)	(17,273)
Net cash provided by operating activities	148,368	115,714
Cash flows from investing activities:
Capital expenditures	(19,784)	(12,803)
Proceeds from sale of property and equipment	573	1,049
Payments for acquisitions, net of cash acquired	(379,272)	(197,672)
Investments in unconsolidated joint ventures	(13,637)	(36,102)
Return of investments in unconsolidated joint ventures	9,443	729
Proceeds from sales of investments in unconsolidated joint ventures	0	14,335
Net cash used in investing activities	(402,677)	(230,464)
Cash flows from financing activities:
Proceeds from borrowings under credit agreement	680,900	0
Repayments of borrowings under credit agreement	(579,700)	(50,000)
Payments for debt costs and credit agreement	(870)	(1,937)
Payments for acquired warrants	(11,243)	0
Contributions by noncontrolling interests	8,299	1,688
Distributions to noncontrolling interests	(14,290)	(37,246)
Repurchases of common stock	(19,500)	(8,701)
Taxes paid on vested stock	(6,135)	(2,242)
Proceeds from issuance of common stock	2,724	2,773
Net cash provided by (used in) financing activities	60,185	(95,665)
Effect of exchange rate changes	(2,220)	(97)
Net decrease in cash, cash equivalents, and restricted cash	(196,344)	(210,512)
Cash, cash equivalents and restricted cash:
Beginning of year	343,883	487,215
End of period	$ 147,539	$ 276,703

Consolidated Statements of Shar

Consolidated Statements of Shareholder's Equity (Unaudited) - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Treasury Stock	Additional Paid-in Capital	Additional Paid-in Capital Revision of Prior Period, Accounting Standards Update, Adjustment	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Revision of Prior Period, Accounting Standards Update, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total Parsons Equity	Total Parsons Equity Revision of Prior Period, Accounting Standards Update, Adjustment	Noncontrolling Interest
Beginning balance at Dec. 31, 2020	$ 1,861,417		$ 146,609	$ (899,328)	$ 2,700,925		$ (120,569)		$ (13,865)	$ 1,813,772		$ 47,645
Beginning balance (ASU 2020-06) at Dec. 31, 2020		$ (37,220)				$ (40,002)		$ 2,782			$ (37,220)
Comprehensive income
Net income	52,810						35,099			35,099		17,711
Foreign currency translation gain (loss), net	3,721								3,721	3,721
Pension adjustments, net	12								12	12
Contributions	1,688											1,688
Distributions	(37,246)											(37,246)
Issuance of equity securities, net of retirements	1,851		143		1,681		27			1,851
Repurchases of common stock	(8,701)		(245)		(8,456)					(8,701)
Stock-based compensation	15,544				15,544					15,544
Ending Balance at Sep. 30, 2021	1,853,876		146,507	(899,328)	2,669,692		(82,661)		(10,132)	1,824,078		29,798
Beginning balance at Jun. 30, 2021	1,850,450		146,752	(899,328)	2,673,965		(102,019)		(5,905)	1,813,465		36,985
Comprehensive income
Net income	26,769						19,358			19,358		7,411
Foreign currency translation gain (loss), net	(4,205)								(4,201)	(4,201)		(4)
Pension adjustments, net	(26)								(26)	(26)
Contributions	816											816
Distributions	(15,410)											(15,410)
Repurchases of common stock	(8,701)		(245)		(8,456)					(8,701)
Stock-based compensation	4,183				4,183					4,183
Ending Balance at Sep. 30, 2021	1,853,876		146,507	(899,328)	2,669,692		(82,661)		(10,132)	1,824,078		29,798
Beginning balance at Dec. 31, 2021	1,937,112		146,277	(867,391)	2,684,979		(53,529)		(9,568)	1,900,768		36,344
Comprehensive income
Net income	90,218						68,533			68,533		21,685
Foreign currency translation gain (loss), net	(9,643)								(9,631)	(9,631)		(12)
Pension adjustments, net	(93)								(93)	(93)
Contributions	8,299											8,299
Distributions	(14,290)											(14,290)
Issuance of equity securities, net of retirements	(2,002)		333		(2,339)		4			(2,002)
Repurchases of common stock	(19,500)		(522)		(18,978)					(19,500)
Stock-based compensation	14,991				14,991					14,991
Ending Balance at Sep. 30, 2022	2,005,092		146,088	(867,391)	2,678,653		15,008		(19,292)	1,953,066		52,026
Beginning balance at Jun. 30, 2022	1,964,667		146,174	(867,391)	2,676,063		(14,565)		(12,100)	1,928,181		36,486
Comprehensive income
Net income	43,595						29,571			29,571		14,024
Foreign currency translation gain (loss), net	(7,134)								(7,124)	(7,124)		(10)
Pension adjustments, net	(68)								(68)	(68)
Contributions	5,472											5,472
Distributions	(3,946)											(3,946)
Issuance of equity securities, net of retirements	(175)		9		(186)		2			(175)
Repurchases of common stock	(3,952)		(95)		(3,857)					(3,952)
Stock-based compensation	6,633				6,633					6,633
Ending Balance at Sep. 30, 2022	$ 2,005,092		$ 146,088	$ (867,391)	$ 2,678,653		$ 15,008		$ (19,292)	$ 1,953,066		$ 52,026

Description of Operations

Description of Operations	9 Months Ended
	Sep. 30, 2022
Description Of Operations Disclosure [Abstract]
Description of Operations	1. Description of Operations Organization Parsons Corporation, a Delaware corporation, and its subsidiaries (collectively, the “Company”) provide sophisticated design, engineering and technical services, and smart and agile software to the United States federal government and Critical Infrastructure customers worldwide. The Company performs work in various foreign countries through local subsidiaries, joint ventures and foreign offices maintained to carry out specific projects.

Basis of Presentation and Princ

Basis of Presentation and Principles of Consolidation	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Principles of Consolidation	2 . The accompanying unaudited consolidated financial statements and related notes of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and pursuant to the interim period reporting requirements of Form 10-Q. They do not include all of the information and footnotes required by GAAP for complete financial statements and, therefore, should be read in conjunction with our consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. In the opinion of management, the consolidated financial statements reflect all normal recurring adjustments necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for any interim period are not necessarily indicative of results for the full year or for future years. This Quarterly Report on Form 10-Q includes the accounts of Parsons Corporation and its subsidiaries and affiliates which it controls. Interests in joint ventures that are controlled by the Company, or for which the Company is otherwise deemed to be the primary beneficiary, are consolidated. For joint ventures in which the Company does not have a controlling interest, but exerts a significant influence, the Company applies the equity method of accounting (see “Note 14 – Use of Estimates The preparation of the consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from those estimates. The Company’s most significant estimates and judgments involve revenue recognition with respect to the determination of the costs to complete contracts and transaction price; determination of self-insurance reserves; useful lives of property and equipment and intangible assets; valuation of deferred income tax assets and uncertain tax positions, among others. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” and “Note 2—Summary of Significant Accounting Polices” in the notes to our consolidated financial statements included in the Company’s Form 10-K for the year ended December 31, 2021, for a discussion of the significant estimates and assumptions affecting our consolidated financial statements. Estimates of costs to complete contracts are continually evaluated as work progresses and are revised when necessary. When a change in estimate is determined to have an impact on contract profit, the Company records a positive or negative adjustment to the consolidated statement of income. Stock Repurchase Plan During the third quarter of 2021, the Company’s Board of Directors authorized the Company to acquire a number of shares of Common Stock having an aggregate market value of not greater than $100,000,000 from time to time. Repurchased shares of common stock are retired and included in “Repurchases of common stock” in cash flows from financing activities in the Consolidated Statements of Cash Flows.

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
New Accounting Pronouncements	3 . In the first quarter of 2022, the Company early adopted ASU No. 2021-08, “Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers”. The new guidance requires that the approach of ASC 606, Revenue from Contracts with Customers, should be used to measure an acquired revenue contract in a business combination. This guidance is to be applied (1) retrospectively to all business combinations for which the acquisition date occurs on or after the beginning of the fiscal year that includes the interim period of early application and (2) prospectively to all business combinations that occur on or after the date of initial application. The early adoption of ASU 2021-08 did not have a material impact on the consolidated financial statements. In the first quarter of 2021, the Company early adopted Accounting Standards Update (“ASU”) ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06)”. The update simplifies the accounting for convertible debt instruments and convertible preferred stock by reducing the number of accounting models and limiting the number of embedded conversion features separately recognized from the primary contract. The guidance also includes targeted improvements to the disclosures for convertible instruments and earnings per share. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020. The Company adopted ASU 2020-06 in the first quarter of 2021 using the modified retrospective method which resulted in a reduction in non-cash interest expense and reclassification of the equity portion of the Convertible Senior Notes to “Long-term debt” on the consolidated balance sheet. In the first quarter of 2021, the Company adopted ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”)”. ASU 2019-12 was issued as a means to reduce the complexity of accounting for income taxes. The guidance is to be applied using a prospective method, excluding amendments related to franchise taxes, which should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The adoption of ASU 2019-12 did not have a material impact on the consolidated financial statements.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2022
Business Combinations [Abstract]
Acquisitions	4. Xator Corporation On May 31, 2022, the Company acquired a 100% ownership interest in Xator Corporation (“Xator”), a privately-owned company, for $388.3 million in cash. The Company borrowed $300 million under the Credit Agreement, as described in “Note 10 – Debt and Credit Facilities”, to partially fund the acquisition. Xator expands Parsons’ customer base and brings differentiated technical capabilities in critical infrastructure protection, counter-unmanned aircraft systems (cUAS), intelligence and cyber solutions, biometrics, and global threat assessment and operations. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed based on the preliminary purchase price allocation as of the date of acquisition (in thousands): Amount Cash and cash equivalents $ 8,935 Accounts receivable 28,199 Contract assets 4,591 Prepaid expenses and other current assets 3,615 Property and equipment 1,699 Right of use assets, operating leases 7,517 Goodwill 252,994 Investments in and advances to unconsolidated joint ventures 698 Intangible assets 123,500 Other noncurrent assets 9,156 Accounts payable (6,626 ) Accrued expenses and other current liabilities (31,119 ) Contract liabilities (2,080 ) Short-term lease liabilities, operating leases (2,371 ) Long-term lease liabilities, operating leases (5,146 ) Other long-term liabilities (9,156 ) Net assets acquired $ 384,406 Of the total purchase price, the following values were preliminarily assigned to intangible assets (in thousands, except for years): Gross Carrying Amount Amortization Period (in years) Customer relationships $ 37,000 15 Backlog 81,000 6 Trade Name 4,000 1 Developed technologies 1,000 3 Non-compete agreements 500 3 Amortization expense of $4.9 million and $6.6 million related to these intangible assets was recorded for the three and nine months ended September 30, 2022, respectively. The amount of revenue generated by Xator and included within consolidated revenues is $70.4 million and $91.2 million for the three and nine months ended September 30, 2022, respectively. presentation of net income from the date of acquisition is impracticable due to the integration of general corporate functions upon acquisition. The company is still in the process of finalizing its valuation of the net assets acquired. Supplemental Pro Forma Information (Unaudited) Supplemental information of unaudited pro forma operating results assuming the Xator acquisition had been consummated as of the beginning of fiscal year 2021 (in thousands) is as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Pro forma Revenue $ 1,134,370 $ 1,027,430 $ 3,199,336 $ 2,920,933 Pro forma Net Income including noncontrolling interests 43,970 28,878 $ 102,860 $ 49,609 BlackHorse Solutions, Inc. On July 6, 2021, the Company acquired a 100% ownership interest in BlackHorse Solutions, Inc (“BlackHorse”), a privately-owned company, for $205.0 million in cash. BlackHorse expands Parsons’ capabilities and products in next-generation military, intelligence, and space operations, specifically in cyber electronic warfare and information dominance. The acquisition was entirely funded by cash on-hand. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed based on the purchase price allocation as of the date of acquisition (in thousands): Amount Cash and cash equivalents $ 15,428 Accounts receivable 3,351 Contract assets 5,979 Prepaid expenses and other current assets 937 Property and equipment 2,239 Right of use assets, operating leases 6,157 Goodwill 143,086 Intangible assets 65,000 Accounts payable (2,326 ) Accrued expenses and other current liabilities (17,190 ) Contract liabilities (320 ) Short-term lease liabilities, operating leases (1,011 ) Long-term lease liabilities, operating leases (5,146 ) Deferred tax liabilities (10,916 ) Other long-term liabilities (235 ) Net assets acquired $ 205,033 Of the total purchase price, the following values were assigned to intangible assets (in thousands, except for years): Gross Carrying Amount Amortization Period (in years) Customer relationships $ 39,000 16 Backlog 23,000 3 Trade name 1,000 2 Developed technologies 1,000 3 Non-compete agreements 1,000 3 Amortization expense of The amount of revenue generated by BlackHorse and included within consolidated revenues is $22.6 million and $66.3 million for the three and nine months ended September 30, 2022, respectively and $16.7 million for the three and nine months ended September 30, 2021. Supplemental Pro Forma Information (Unaudited) Supplemental information of unaudited pro forma operating results assuming the BlackHorse acquisition had been consummated as of the beginning of fiscal year 2020 (in thousands) is as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Pro forma Revenue $ 1,134,370 $ 957,498 $ 3,092,160 $ 2,748,559 Pro forma Net Income including noncontrolling interests 44,766 30,608 95,299 $ 56,232 Echo Ridge LLC On July 30, 2021, the Company acquired a 100% ownership interest in Echo Ridge LLC (“Echo Ridge”), a privately-owned company, for $9.0 million in cash. Echo Ridge adds position, navigation, and timing devices; modeling, simulation, test, and measurement tools; and deployable software defined radio products and signal processing services to Parsons’ space portfolio. The acquisition was entirely funded by cash on-hand. The Company allocated the purchase price to the appropriate classes of tangible assets and liabilities and assigned the excess of $7.2 million to goodwill. The entire value of goodwill was assigned to

Contracts with Customers

Contracts with Customers	9 Months Ended
	Sep. 30, 2022
Revenue From Contract With Customer [Abstract]
Contracts with Customers	5 . Contracts with Customers Disaggregation of Revenue The Company’s contracts contain both fixed-price and cost reimbursable components. Contract types are based on the component that represents the majority of the contract. The following table presents revenue disaggregated by contract type (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Fixed-Price $ 334,853 $ 246,894 $ 854,835 $ 710,067 Time-and-Materials 302,236 261,566 836,881 754,596 Cost-Plus 497,281 447,590 1,400,444 1,245,440 Total $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103 See “Note 18 – Segments Information” for the Company’s revenues by business lines. Contract Assets and Contract Liabilities Contract assets and contract liabilities balances at September 30, 2022 and December 31, 2021 were as follows (in thousands): September 30, 2022 December 31, 2021 $ change % change Contract assets $ 642,264 $ 579,216 $ 63,048 10.9 % Contract liabilities 197,749 171,671 26,078 15.2 % Net contract assets (liabilities) (1) $ 444,515 $ 407,545 $ 36,970 9.1 % (1) Total contract retentions included in net contract assets (liabilities) were $74.2 million During the three months ended September 30, 2022 and September 30, 2021, the Company recognized revenue of $10.1 million and $3.0 million, respectively, and $91.8 million and $95.5 million during the nine months ended September 30, 2022 and September 30, 2021, respectively, September 30, 2022 December 31, 2021 Acquired contract assets $ 4,591 $ 5,979 Acquired contract liabilities 2,080 320 There was no significant impairment of contract assets recognized during the nine months ended September 30, 2022 and September 30, 2021. Revisions in estimates, such as changes in estimated claims or incentives, related to performance obligations partially satisfied in previous periods that individually had an impact of $5 million or more on revenue resulted in the following changes in revenue: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue impact, net $ - $ (6,300 ) $ - $ (27,553 ) Accounts Receivable, net Accounts receivable, net consisted of the following as of September 30, 2022 and December 31, 2021 (in thousands): 2022 2021 Billed $ 487,221 $ 434,776 Unbilled 227,453 167,490 Total accounts receivable, gross 714,674 602,266 Allowance for doubtful accounts (3,953 ) (3,955 ) Total accounts receivable, net $ 710,721 $ 598,311 Billed accounts receivable represents amounts billed to clients that have not been collected. Unbilled accounts receivable represents amounts where the Company has a present contractual right to bill but an invoice has not been issued to the customer at the period-end date. The allowance for doubtful accounts was determined based on consideration of trends in actual and forecasted credit quality of clients, including delinquency and payment history, type of client, such as a government agency or commercial sector client, and general economic conditions and particular industry conditions that may affect a client’s ability to pay. Transaction Price Allocated to the Remaining Unsatisfied Performance Obligations The Company’s remaining unsatisfied performance obligations (“RUPO”) as of September 30, 2022 represent a measure of the total dollar value of work to be performed on contracts awarded and in-progress. The Company had $5.8 billion in RUPO as of September 30, 2022. RUPO will increase with awards of new contracts and decrease as the Company performs work and recognizes revenue on existing contracts. Projects are included within RUPO at such time the project is awarded and agreement on contract terms has been reached. The difference between RUPO and backlog relates to unexercised option years that are included within backlog and the value of Indefinite Delivery/Indefinite Quantity (“IDIQ”) contracts included in backlog for which delivery orders have not been issued. RUPO is comprised of: (a) original transaction price, (b) change orders for which written confirmations from our customers have been received, (c) pending change orders for which the Company expects to receive confirmations in the ordinary course of business, and (d) claim amounts that the Company has made against customers for which it has determined that it has a legal basis under existing contractual arrangements and a significant reversal of revenue is not probable, less revenue recognized to-date. The Company expects to satisfy its RUPO as of September 30, 2022 over the following periods (in thousands): Period RUPO Will Be Satisfied Within One Year Within One to Two Years Thereafter Federal Solutions $ 1,598,275 $ 638,502 $ 252,481 Critical Infrastructure 1,532,842 895,714 894,720 Total $ 3,131,117 $ 1,534,216 $ 1,147,201

Leases

Leases	9 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Leases	6. The Company has operating and finance leases for corporate and project office spaces, vehicles, heavy machinery and office equipment. Our leases have remaining lease terms of one year to 8 years, some of which may include options to extend the leases for up to five years, and some of which may include options to terminate the leases after the third year. The components of lease costs for the three and nine months ended September 30, 2022 and September 30, 2021 are as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Operating lease cost $ 16,299 $ 16,900 $ 49,049 $ 49,500 Short-term lease cost 3,858 3,661 10,948 7,859 Amortization of right-of-use assets 571 540 1,721 1,557 Interest on lease liabilities 24 24 67 81 Sublease income (1,318 ) (960 ) (3,321 ) (2,529 ) Total lease cost $ 19,434 $ 20,165 $ 58,464 $ 56,468 Supplemental cash flow information related to leases for the three months ended September 30, 2022 and September 30, 2021 is as follows (in thousands): Nine Months Ended September 30, 2022 September 30, 2021 Operating cash flows for operating leases $ 51,988 $ 50,029 Operating cash flows for finance leases 67 82 Financing cash flows from finance leases 1,580 1,539 Right-of-use assets obtained in exchange for new operating lease liabilities 15,709 7,456 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1,156 $ 619 Supplemental balance sheet and other information related to leases as of September 30, 2022 and December 31, 2021 are as follows (in thousands): September 30, 2022 December 31, 2021 Operating Leases: Right-of-use assets $ 161,602 $ 182,672 Lease liabilities: Current $ 59,056 $ 55,902 Long-term 121,172 148,893 Total operating lease liabilities $ 180,228 $ 204,795 Finance Leases: Other noncurrent assets $ 3,829 $ 4,389 Accrued expenses and other current liabilities $ 1,707 $ 1,822 Other long-term liabilities $ 2,117 $ 2,422 Weighted Average Remaining Lease Term: Operating leases 3.8 Years 4.3 years Finance leases 2.6 Years 2.9 years Weighted Average Discount Rate: Operating leases 3.4 % 3.5 % Finance leases 2.4 % 2.1 % As of September 30, 2022, the Company has no operating leases that have not yet commenced. A maturity analysis of the future undiscounted cash flows associated with the Company’s operating and finance lease liabilities as of September 30, 2022 is as follows (in thousands): Operating Leases Finance Leases 2022 (remaining) $ 18,562 $ 495 2023 59,464 1,590 2024 44,371 1,067 2025 33,246 676 2026 19,366 103 Thereafter 17,204 - Total lease payments 192,213 3,931 Less: imputed interest (11,985 ) (107 ) Total present value of lease liabilities $ 180,228 $ 3,824

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	7 . The following table summarizes the changes in the carrying value of goodwill by reporting segment from December 31, 2021 to September 30, 2022 (in thousands): December 31, 2021 Acquisitions Foreign Exchange September 30, 2022 Federal Solutions $ 1,339,117 $ 252,250 $ - $ 1,591,367 Critical Infrastructure 73,573 - (3,833 ) 69,740 Total $ 1,412,690 $ 252,250 $ (3,833 ) $ 1,661,107 The Company performed a qualitative triggering analysis and determined there was no triggering event indicating a potential impairment to the carrying value of its goodwill at September 30, 2022 and, therefore, concluded there has not been an impairment.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	8. The gross amount and accumulated amortization of intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets are as follows (in thousands except for years): September 30, 2022 December 31, 2021 Weighted Average Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period (in years) Backlog $ 251,455 $ (146,432 ) $ 105,023 $ 169,455 $ (126,637 ) $ 42,818 4 Customer relationships 338,829 (182,689 ) 156,140 301,829 (158,405 ) 143,424 9 Leases 670 (632 ) 38 670 (618 ) 52 5 Developed technology 114,939 (109,135 ) 5,804 113,939 (96,765 ) 17,174 4 Trade name 13,200 (10,158 ) 3,042 9,200 (8,444 ) 756 1 Non-compete agreements 5,750 (4,221 ) 1,529 5,250 (3,523 ) 1,727 3 In process research and development 1,800 - 1,800 1,800 - 1,800 n/a Other intangibles 275 (209 ) 66 275 (205 ) 70 10 Total intangible assets $ 726,918 $ (453,476 ) $ 273,442 $ 602,418 $ (394,597 ) $ 207,821 The aggregate amortization expense of intangible assets for the three months ended September 30, 2022 and September 30, 2021 was $19.1 million and $27.0 million, respectively, and $58.9 million and $76.1 million for the nine months ended September 30, 2022 and September 30, 2021, respectively. Estimated amortization expense for the remainder of the current fiscal year and in each of the next four years and beyond is as follows (in thousands): September 30, 2022 2022 $ 19,314 2023 68,256 2024 35,359 2025 29,818 2026 26,238 Thereafter 92,657 Total $ 271,642

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Property and Equipment, Net	9 . Property and equipment consisted of the following at September 30, 2022 and December 31, 2021 (in thousands): September 30, 2022 December 31, 2021 Useful life (years) Buildings and leasehold improvements $ 102,527 $ 99,543 1-15 Furniture and equipment 87,685 86,862 3-10 Computer systems and equipment 160,583 157,633 3-10 Construction equipment 6,190 6,806 5-7 Construction in progress 14,895 12,970 371,880 363,814 Accumulated depreciation (277,362 ) (259,618 ) Property and equipment, net $ 94,518 $ 104,196 Depreciation expense for the three months ended September 30, 2022 and September 30, 2021 was $9.7 million and $9.6 million, respectively, and $29.3 million and $28.8 million for the nine months ended September 30, 2022 and September 30, 2021, respectively.

Debt and Credit Facilities

Debt and Credit Facilities	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt and Credit Facilities	1 0 . Debt consisted of the following (in thousands): September 30, 2022 December 31, 2021 Long-Term: Revolving credit facility $ 101,200 $ - Senior notes 200,000 200,000 Convertible senior notes 400,000 400,000 Debt issuance costs (6,482 ) (8,078 ) Total long-term 694,718 591,922 Total Debt $ 694,718 $ 591,922 Revolving Credit Facility In June 2021 agreement, the Company’s revolving credit facility was increased from $ million to $ million . The credit facility has a five - year maturity, which may be extended up to two times for periods determined by the Company and the applicable extending lenders, and permits the Company to borrow in U.S. dollars, certain specified foreign currencies, and each other currency that may be approved in accordance with the 2021 Facility. The borrowings under the Credit Agreement bear interest at either a n adjusted Term SOFR benchmark rate plus a margin between 1.0 % and 1.625 % or a base rate (as defined in the Credit Agreement) plus a margin of between 0 % and 0.625 %. The rates on September 3 0 , 2022 and December 31, 2021 were 4.46 % and %, respectively. Borrowings under this Credit Agreement are guaranteed by certain Company operating subsidiaries. Letters of credit commitments outstanding under this agreement aggregated to $ million and $ million at September 3 0 , 2022 and December 31, 2021 , respectively, which reduced borrowing limits available to the Company. Interest expense related to the C redit A greement was $2.5 million and $ 0.1 million for the three months ended September 30 , 2022 and September 30 , 2021 , respectively and was $ 3.4 million and $ million for nine months ended September 30, 2022 and September 30, 2021, respectively . The Company borrowed $ 300.0 million to partially fund the acquisition of Xator on May 31 , 2022. There w as $ 101.2 million outstanding under the Credit Agreement on September 30 , 2022 . Delayed Draw Term Loan In September 2022 The 2022 Delayed Draw Term Loan has a three-year Private Placement On July 1, 2014, the Company finalized a private placement whereby the Company raised an aggregate amount of $250.0 million in debt as follows (in thousands): Tranche Debt Amount Maturity Date Interest Rates Senior Note, Series A $ 50,000 July 15, 2021 4.44 % Senior Note, Series B 100,000 July 15, 2024 4.98 % Senior Note, Series C 60,000 July 15, 2026 5.13 % Senior Note, Series D 40,000 July 15, 2029 5.38 % The Company incurred $1.1 million of debt issuance costs in connection with the private placement. On August 10, 2018, the Company finalized an amended and restated intercreditor agreement related to this private placement to more closely align certain covenants and definitions with the terms under the 2017 amended and restated Credit Agreement and incurred $0.5 million of additional issuance costs. These costs are presented as a direct deduction from the debt on the face of the consolidated balance sheets. Interest expense related to the Senior Notes for the three months ended September 30, 2022 and September 30, 2021 was $2.6 million and $2.7 million, respectively, and was $7.8 million and $8.9 million for the nine months ended September 30, 2022 and September 30, 2021, respectively. debt issuance costs and interest expense is recorded in “Interest expense” on the consolidated statements of income. The Company paid the $ 50 million Series A tranche of the Senior Note as scheduled in July 2021. The Company made interest payments of $ 5.1 million for the thre e months ended September 30, 2022 and $ 10.2 million for the ni n e months ended September 30, 2022 , and $ 6.2 million for the three months ended September 30, 2021 and $ 12.4 million for the nine months ended September 30, 2021 . Interest payable of $ 2.2 million and $ 4.7 million is recorded in “Accrued expenses and other current liabilities” on the consolidated balance sheets at September 3 0 , 2022 and December 31, 2021 , respectively, related to the Senior Notes . Using a discounted cash flow technique that incorporates a market interest yield curve with adjustments for duration, optionality, and risk profile, the Company estimated that the fair value (Level 2) of its Senior Notes at September 30, 2022 approximates $203.5 million. See “Note 16 – Fair Value of Financial Instruments” for the definition of Level 2 of the fair value hierarchy. The Credit Agreement and private placement includes various covenants, including restrictions on indebtedness, liens, acquisitions, investments or dispositions, payment of dividends and maintenance of certain financial ratios and conditions. The Company was in compliance with these covenants at September 30, 2022 and December 31, 2021. The Company also has in place several secondary bank credit lines for issuing letters of credit, principally for foreign contracts, to support performance and completion guarantees. Letters of credit commitments outstanding under these bank lines aggregated $239.8 million and $223.0 million at September 30, 2022 and December 31, 2021, respectively. Convertible Senior Notes In August 2020, the Company issued an aggregate $400.0 million of 0.25% Convertible Senior Notes due 2025, including the exercise of a $50.0 million initial purchasers’ option. The Company received proceeds from the issuance and sale of the Convertible Senior Notes of $389.7 million, net of $10.3 million of transaction fees and other third-party offering expenses. The Convertible Senior Notes accrue interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021, and will mature on August 15, 2025, unless earlier repurchased, redeemed or converted. The Convertible Senior Notes are the Company’s senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment to any of the Company’s unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness, to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of the Company’s subsidiaries Each $1,000 of principal of the Notes will initially be convertible into 22.2913 shares of our common stock, which is equivalent to an initial conversion price of $44.86 per share, subject to adjustment upon the occurrence of specified events. On or after March 15, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date of the Convertible Senior Notes, holders may convert all or a portion of their Convertible Senior Notes, regardless of the conditions below. Prior to the close of business on the business day immediately preceding March 15, 2025, the Notes will be convertible at the option of the holders thereof only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on December 31, 2021, if the last reported sale price of the Company’s common stock for at least 20 trading days, whether or not consecutive, during a period of 30 consecutive trading days ending on, and including the last trading day of the immediately preceding calendar quarter, is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period in which, for each trading day of that period, the trading price per $1,000 principal amount of Convertible Senior Notes for such trading day was less than 98 % of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; • if the Company calls such Convertible Senior Notes for redemption; or • upon the occurrence of specified corporate events described in the Indenture. The Company may redeem all or any portion of the Convertible Senior Notes for cash, at its option, on or after August 21, 2023 and before the 51 st Upon the occurrence of a fundamental change prior to the maturity date of the Convertible Senior Notes, holders of the Convertible Senior Notes may require the Company to repurchase all or a portion of the Convertible Senior Notes for cash at a price equal to 100% of the principal amount of the Convertible Senior Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. Upon conversion, the Company may settle the Convertible Senior Notes for cash, shares of the Company’s common stock, or a combination thereof, at the Company’s option. If the Company satisfies its conversion obligation solely in cash or through payment and delivery of a combination of cash and shares of the Company’s common stock, the amount of cash and shares of common stock due upon conversion will be based on a daily conversion value calculated on a proportionate basis for each trading day in a 50-trading day observation period. Under existing GAAP at the time of issuance during 2020, convertible debt instruments that may be settled in cash on conversion were required to be separated into liability and equity components in a manner that reflects the issuer’s non-convertible debt borrowing rate. The carrying amount of the liability component was based on the fair value of a similar instrument that did not contain an equity conversion option. The carrying amount allocated to the equity component, which is recognized as a debt discount, represented the difference between the proceeds from the issuance of the notes and the fair value of the liability component of the notes. Based on this debt to equity ratio, debt issuance costs were then allocated to the liability and equity components in a similar manner. Accordingly, at issuance the Company allocated $336.1 million to the debt liability and $53.6 million to additional paid-in capital. The difference between the principal amount of the Convertible Senior Notes and the liability component, inclusive of issuance costs, represented the debt discount, which the Company amortized to interest expense over the term of the Convertible Senior Notes using an effective interest rate of 3.25%. During the year ended December 31, 2020, the Company recognized interest expense of $4.4 million. As of December 31, 2020, the net carrying value of the Notes was $340.6 million. In the first quarter of 2021, the Company early adopted ASU 2020-06, “Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Equity’s Own Equity (Subtopic 815-40)”. The Company used the modified retrospective method which resulted in a reduction in non-cash interest expense and reclassification of equity component of the convertible senior notes of $55.0 million and equity component of the debt issuance costs of $1.4 million to liabilities on the consolidated balance sheet. The Company also adjusted the carrying amount of the convertible senior notes to what it would have been if the Company had applied ASU 2020-06 from the inception of the Notes and recorded the offset of the carrying amount adjustment of $3.7 million in retained earnings on January 1, 2021. The Company recognized interest expense of $0.7 million and $0.7 million for the three months ended September 30, 2022 and September 30, 2021, respectively, and $2.2 million and $2.2 million for the nine months ended September 30, 2022 and September 30, 2021, respectively. Convertible Note Hedge and Warrant Transactions In connection with the sale of the Convertible Senior Notes, the Company purchased a bond hedge designed to mitigate the potential dilution from the conversion of the Convertible Senior Notes. Under the five-year The cost of the convertible note hedge was partially offset by the Company’s sale of warrants to acquire approximately 8.9 million shares of the Company’s common stock. The warrants were initially exercisable at a price of at least $66.46 per share and are subject to customary adjustments upon the occurrence of certain events, such as the payment of dividends. The Company received $13.8 million in cash proceeds from the sales of these warrants. The bond hedge and warrant transactions effectively increased the conversion price associated with the Convertible Senior Notes during the term of these transactions from 35%, or $44.86, to 100%, or $66.46, at their issuance, thereby reducing the dilutive economic effect to shareholders upon actual conversion. The bond hedges and warrants are indexed to, and potentially settled in, shares of the Company’s common stock. The net cost of $41.2 million for the purchase of the bond hedges and sale of the warrants was recorded as a reduction to additional paid-in capital in the consolidated balance sheets. At issuance, the Company recorded a deferred tax liability of $16.2 million related to the Convertible Senior Notes debt discount and the capitalized debt issuance costs. The Company also recorded a deferred tax asset of $16.5 million related to the convertible note hedge transactions and the tax basis of the capitalized debt issuance costs through additional paid-in capital. The deferred tax liability and deferred tax asset were included net in “Deferred tax assets” on the consolidated balance sheets. Upon adoption of ASU 2020-06, the Company reversed the deferred tax liability of $13.9 million that the Company had recorded at issuance related to the Convertible Senior Note debt discount and recorded an additional deferred tax liability of $0.4 million related to the capitalized debt issuance costs. In addition, the Company recorded a $0.9 million adjustment to the deferred tax asset through retained earnings related to the tax effect of book accretion recorded in 2020 and reversed upon adoption.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	11. On August 9, President Biden signed the Creating Helpful Incentives to Produce Semiconductors (CHIPS) Act into law, which includes an advanced manufacturing investment tax credit, among other provisions. On August 16, President Biden signed the Inflation Reduction Act (the IRA) into law, which includes implementation of a new alternative minimum tax, an excise tax on stock buybacks, and tax incentives for energy and climate initiatives, among other provisions. Based on the Company’s review, these new laws do not result in a material change to the Company’s income tax provision for 2022. The Company’s effective tax rate was 24.0% and 25.5% for the three months ended September 30, 2022 and 2021, respectively. The change in the effective tax rate was due primarily to a decrease in withholding tax, a change in jurisdictional mix of earnings and a nonrecurring write down of a foreign tax receivable included in 2021, partially offset by a release of a valuation allowance included in 2021. state income taxes, partially offset by benefits related to untaxed income attributable to noncontrolling interests, earnings in lower tax jurisdictions, and federal research tax credits. As of September 30, 2022, the Company’s deferred tax assets were subject to a valuation allowance of $28.5 million primarily related to foreign net operating loss carryforwards, foreign tax credit carryforwards, and capital losses that the Company has determined are not more-likely-than-not to be realized. The factors used to assess the likelihood of realization include: the past performance of the entities, forecasts of future taxable income, future reversals of existing taxable temporary differences, and available tax planning strategies that could be implemented to realize the deferred tax assets. The ability or failure to achieve the forecasted taxable income in these entities could affect the ultimate realization of deferred tax assets . As of September 30, 2022 and December 31, 2021, the liability for income taxes associated with unrecognized tax benefits was $22.7 million and $21.2 million, respectively. It is reasonably possible that the Company may realize a decrease in our unrecognized tax benefits of approximately $4.0 million during the next 12 months as a result of concluding various tax audits and closing tax years. Although the Company believes its reserves for its tax positions are reasonable, the final outcome of tax audits could be materially different, both favorably and unfavorably. It is reasonably possible that certain audits may conclude in the next 12 months and that the unrecognized tax benefits the Company has recorded in relation to these tax years may change compared to the liabilities recorded for these periods. However, it is not currently possible to estimate the amount, if any, of such change.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Contingencies	1 2 . The Company is subject to certain lawsuits, claims and assessments that arise in the ordinary course of business. Additionally, the Company has been named as a defendant in lawsuits alleging personal injuries as a result of contact with asbestos products at various project sites. Management believes that any significant costs relating to these claims will be reimbursed by applicable insurance and, although there can be no assurance that these matters will be resolved favorably, management believes that the ultimate resolution of any of these claims will not have a material adverse effect on our consolidated financial position, results of operations, or cash flows. A liability is recorded when it is both probable that a loss has been incurred and the amount of loss or range of loss can be reasonably estimated. When using a range of loss estimate, the Company records the liability using the low end of the range unless some amount within the range of loss appears at that time to be a better estimate than any other amount in the range. The Company records a corresponding receivable for costs covered under its insurance policies. Management judgment is required to determine the outcome and the estimated amount of a loss related to such matters. Management believes that there are no claims or assessments outstanding which would materially affect the consolidated results of operations or the Company’s financial position. In September 2015, a former Parsons employee filed an action in the United States District Court for the Northern District of Alabama against us as a qui tam relator on behalf of the United States (the “Relator”) alleging violation of the False Claims Act. The United States government did not intervene in this matter as it is allowed to do so under the statute. The Company filed a motion to dismiss the lawsuit on the grounds that the Relator did not meet the applicable statute of limitations. The District Court granted the motion to dismiss. The Relator’s attorney appealed the decision to the United States Court of Appeals of the Eleventh Circuit, which ultimately ruled in favor of the Relator, and the Company petitioned the United States Supreme Court to review the decision. The Supreme Court reviewed the decision and accepted the position of the Relator. The case was thus remanded to the United States District Court for the Northern District of Alabama. The defendants, including Parsons, will file appropriate pleadings opposing the allegations. At this time, the Company is unable to determine the probability of the outcome of the litigation or determine a potential range of loss, if any. Federal government contracts are subject to audits, which are performed for the most part by the Defense Contract Audit Agency (“DCAA”). Audits by the DCAA and other agencies consist of reviews of our overhead rates, operating systems and cost proposals to ensure that we account for such costs in accordance with the Cost Accounting Standards (“CAS”). If the DCAA determines we have not accounted for such costs in accordance with the CAS, the DCAA may disallow these costs. The disallowance of such costs may result in a reduction of revenue and additional liability for the Company. Historically, the Company has not experienced any material disallowed costs as a result of government audits. However, the Company can provide no assurance that the DCAA or other government audits will not result in material disallowances for incurred costs in the future. All audits of costs incurred on work performed through 2013 have been closed, and years thereafter remain open. Although there can be no assurance that these matters will be resolved favorably, management believes that their ultimate resolution will not have a material adverse impact on the Company’s consolidated financial position, results of operations, or cash flows.

Retirement Benefit Plan

Retirement Benefit Plan	9 Months Ended
	Sep. 30, 2022
Compensation And Retirement Disclosure [Abstract]
Retirement Benefit Plan	1 3 . The Company’s principal retirement benefit plan is the Parsons Employee Stock Ownership Plan (“ESOP”), a stock bonus plan, established in 1975 to cover eligible employees of the Company and certain affiliated companies. Contributions of treasury stock to the ESOP are made annually in amounts determined by the Company’s board of directors and are held in trust for the sole benefit of the participants. Shares allocated to a participant’s account are fully vested after three years of credited service, or in the event(s) of reaching age 65, death or disability while an active employee of the Company. As of September 30, 2022 and December 31, 2021, total shares of the Company’s common stock outstanding were 103,470,622 and 103,659,731, respectively, of which 64,144,230 A participant’s interest in their ESOP account is redeemable upon certain events, including retirement, death, termination due to permanent disability, a severe financial hardship following termination of employment, certain conflicts of interest following termination of employment, or the exercise of diversification rights. Distributions from the ESOP of participants’ interests are made in the Company’s common stock based on quoted prices of a share of the Company’s common stock on the NYSE. A participant will be able to sell such shares of common stock in the market, subject to any requirements of the federal securities laws. Total ESOP contribution expense was $15.4 million and $14.8 million for the three months ended September 30, 2022 and September 30, 2021, respectively, and $42.0 million and $41.3 million for the nine months ended September 30, 2022 and September 30, 2021, respectively.

Investments in and Advances to

Investments in and Advances to Joint Ventures	9 Months Ended
	Sep. 30, 2022
Equity Method Investments And Joint Ventures [Abstract]
Investments in and Advances to Joint Ventures	1 4 . The Company participates in joint ventures to bid, negotiate and complete specific projects. The Company is required to consolidate these joint ventures if it holds the majority voting interest or if the Company meets the criteria under the consolidation model, as described below. The Company performs an analysis to determine whether its variable interests give the Company a controlling financial interest in a Variable Interest Entity (“VIE”) for which the Company is the primary beneficiary and should, therefore, be consolidated. Such analysis requires the Company to assess whether it has the power to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company analyzed all of its joint ventures and classified them into two groups: (1) joint ventures that must be consolidated because they are either not VIEs and the Company holds the majority voting interest, or because they are VIEs and the Company is the primary beneficiary; and (2) joint ventures that do not need to be consolidated because they are either not VIEs and the Company holds a minority voting interest, or because they are VIEs and the Company is not the primary beneficiary. Many of the Company’s joint venture agreements provide for capital calls to fund operations, as necessary; however, such funding is infrequent and is not anticipated to be material. Letters of credit outstanding described in “Note 10 – Debt and Credit Facilities” that relate to project ventures are $99.2 million and In the table below, aggregated financial information relating to the Company’s joint ventures is provided because their nature, risk and reward characteristics are similar. None of the Company’s current joint ventures that meet the characteristics of a VIE are individually significant to the consolidated financial statements. Consolidated Joint Ventures The following represents financial information for consolidated joint ventures included in the consolidated financial statements (in thousands): September 30, 2022 December 31, 2021 Current assets $ 268,561 $ 246,342 Noncurrent assets 7,885 2,180 Total assets 276,446 248,522 Current liabilities 169,233 175,637 Total liabilities 169,233 175,637 Total joint venture equity $ 107,213 $ 72,885 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue $ 130,344 $ 101,816 $ 333,967 $ 296,685 Costs 101,882 86,726 289,485 260,129 Net income $ 28,462 $ 15,090 $ 44,482 $ 36,556 Net income attributable to noncontrolling interests $ 14,024 $ 7,411 $ 21,685 $ 17,711 The assets of the consolidated joint ventures are restricted for use only by the particular joint venture and are not available for the Company’s general operations. Unconsolidated Joint Ventures The Company accounts for its unconsolidated joint ventures using the equity method of accounting. Under this method, the Company recognizes its proportionate share of the net earnings of these joint ventures as “Equity in earnings (loss) of unconsolidated joint ventures” in the consolidated statements of income. The Company’s maximum exposure to loss as a result of its investments in unconsolidated joint ventures is typically limited to the aggregate of the carrying value of the investment and future funding commitments. The following represents the financial information of the Company’s unconsolidated joint ventures as presented in their unaudited financial statements (in thousands): September 30, 2022 December 31, 2021 Current assets $ 1,770,762 $ 1,620,735 Noncurrent assets 487,823 531,261 Total assets 2,258,585 2,151,996 Current liabilities 1,357,131 1,088,985 Noncurrent liabilities 467,030 669,911 Total liabilities 1,824,161 1,758,896 Total joint venture equity $ 434,424 $ 393,100 Investments in and advances to unconsolidated joint ventures $ 99,424 $ 110,688 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue $ 782,880 $ 728,461 $ 1,762,420 $ 1,701,262 Costs 774,030 697,493 1,711,555 1,604,538 Net income $ 8,850 $ 30,968 $ 50,865 $ 96,724 Equity in earnings of unconsolidated joint ventures $ (974 ) $ 9,570 $ 10,237 $ 26,528 The Company received net distributions from its unconsolidated joint ventures for the three months ended September 30, 2022 and September 30, 2021 of $13.2 million and $7.3 million, respectively. The Company received net distributions from its unconsolidated joint ventures for the nine months ended September 30, 2022 of $21.4 million and had net contributions to its unconsolidated joint ventures for the nine months ended September 30, 2021 of $0.5 million. For the three and nine months ended September 30, 2022, the Company recorded write-downs of $6.4 million and $9.4 million, respectively, on an unconsolidated joint venture in the Critical Infrastructure segment as a result of changes in estimates made by the managing partner. The write-downs decreased operating and net income by $6.4 million and $4.8 million, respectively for the three months ended September 2022. Operating and net income were decreased by $9.4 million and $7.0 million, respectively, for the nine months ended September 30, 2022. The write-downs decreased diluted earnings per share by $0.04 and $0.06 for the three and nine months ended September 30, 2022. For the three and nine months ended September 30, 2021, the Company recorded write-downs of $5.5 million and $10.6 million, respectively, on an unconsolidated joint venture in the Critical Infrastructure segment as a result of changes in estimates made by the managing partner. The write-downs decreased operating and net income by $5.5 million and $4.1 million, respectively for the three months ended September 2021. Operating and net income were decreased by $10.6 million and $7.9 million, respectively, for the nine months ended September 30, 2021. The write-downs decreased diluted earnings per share by $0.04 and $0.07 for the three and nine months ended September 30, 2021.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	15. The Company often provides services to unconsolidated joint ventures and revenues include amounts related to recovering costs for these services. Revenues related to services the Company provided to unconsolidated joint ventures for the three months ended September 30, 2022 and September 30, 2021 were $59.9 million and $48.3 million, respectively, and $159.0 million and $152.9 million for the nine months ended September 30, 2022 and September 30, 2021, respectively. For the three months ended September 30, 2022 and September 30, 2021, the Company incurred $41.7 million and $37.3 million, respectively, and for the nine months ended September 30, 2022 and September 30, 2021 incurred $112.7 million and $116.9 million, respectively, of reimbursable costs. The revenue and reimbursable cost prior period amounts have been updated to reflect all joint ventures for the comparable period. Amounts included in the consolidated balance sheets related to services the Company provided to unconsolidated joint ventures are as follows (in thousands): September 30, 2022 December 31, 2021 Accounts receivable $ 37,657 $ 30,246 Contract assets 27,037 16,069 Contract liabilities 12,642 10,605

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	1 6 . The authoritative guidance on fair value measurement defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (referred to as an “exit price”). At September 30, 2022 and December 31, 2021, the Company’s financial instruments include cash, cash equivalents, accounts receivable, accounts payable, debt and other liabilities. The fair values of these financial instruments approximate their carrying values due to their short-term maturities. Investments measured at fair value are based on one or more of the following three valuation techniques: • Market approach —Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; • Cost approach —Amount that would be required to replace the service capacity of an asset (i.e., replacement cost); and • Income approach —Techniques to convert future amounts to a single present amount based on market expectations (including present value techniques, option-pricing models and lattice models). In addition, the guidance establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are: Level 1 Unadjusted quoted prices in active markets that are accessible at the measurement date for identical assets and liabilities; Level 2 Pricing inputs that include quoted prices for similar assets and liabilities in active markets and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the instrument; and Level 3 Prices or valuations that require inputs that are both significant to the fair value measurements and unobservable. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. Refer to Notes to Consolidated Financial Statements included in the Company’s Form 10-K for the year ended December 31, 2021 for a more complete discussion of the various items within the consolidated financial statements measured at fair value and the methods used to determine fair value.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings Per Share	1 7 . The following tables reconcile the denominator and numerator used to compute basic earnings per share (“EPS”) to the denominator and numerator used to compute diluted EPS for the three and nine months ended September 30, 2022 and September 30, 2021. Basic EPS is computed using the weighted average number of shares outstanding during the period and income available to shareholders. Diluted EPS is computed similar to basic EPS, except the income available to shareholders is adjusted to add back interest expense, after tax, related to the Convertible Senior Note, and the weighted average number of shares outstanding is adjusted to reflect the dilutive effects of stock-based awards and shares underlying the Convertible Senior Note. Dilutive potential common shares include, when circumstances require, shares the Company could be obligated to issue from its Convertible Senior Notes and warrants (see Note 10 for further discussion) and stock-based awards. Shares to be provided to the Company from its bond hedge purchased concurrently with the issuance of Convertible Senior Notes are anti-dilutive and are not included in its diluted shares. Anti-dilutive stock-based awards excluded from the calculation of earnings per share for the three months ended September 30, 2022 and September 30, 2021 were 2,449 and 4,656, respectively, and for the nine months ended September 30, 2022 and September 30, 2021 were 11,564 and 6,838, respectively. The weighted average number of shares used to compute basic and diluted EPS were: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Basic weighted average number of shares outstanding 103,608,135 102,478,095 103,684,048 102,463,511 Stock-based awards 918,090 751,807 746,702 637,686 Convertible senior notes 8,916,530 8,916,530 8,916,530 8,916,530 Diluted weighted average number of shares outstanding 113,442,755 112,146,432 113,347,280 112,017,727 The net income available to shareholders to compute basic and diluted EPS were (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Net income attributable to Parsons Corporation 29,571 19,358 68,533 35,099 Convertible senior notes if-converted method interest adjustment 545 534 1,627 1,593 Diluted net income attributable to Parsons Corporation 30,116 19,892 70,160 36,692 Share Repurchases In August 2021, the Company’s Board of Directors authorized a stock repurchase program to repurchase up to $100.0 million of shares of Common stock. Repurchases under this stock repurchase program commenced on August 12, 2021. Any and all shares of Common Stock purchased by the Company pursuant to the program shall be retired upon their acquisition and shall not become treasury shares but instead shall resume the status of authorized but unissued shares of Common Stock. The table below presents information on this repurchase program: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Total shares repurchased 95,413 245,000 522,501 245,000 Total shares retired 95,413 245,000 522,501 245,000 Average price paid per share $ 41.42 $ 35.51 $ 37.32 $ 35.51 As of September 30, 2022, the Company has $58.8 million remaining under the stock repurchase program.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Segment Information	18. The Company operates in two reportable segments: Federal Solutions and Critical Infrastructure. The Federal Solutions segment provides advanced technical solutions to the U.S. government, delivering timely, cost-effective hardware, software and services for mission-critical projects. The segment provides advanced technologies, supporting national security missions in cybersecurity, missile defense, and military facility modernization, logistics support, hazardous material remediation and engineering services. The Critical Infrastructure segment provides integrated engineering and management services for complex physical and digital infrastructure around the globe. The Critical Infrastructure segment is a technology innovator focused on next generation digital systems and complex structures. Industry leading capabilities in engineering and project management allow the Company to deliver significant value to customers by employing cutting-edge technologies, improving timelines and reducing costs. The Company defines its reportable segments based on the way the chief operating decision maker (“CODM”), its Chairwoman and Chief Executive Officer, evaluates the performance of each segment and manages the operations of the Company for purposes of allocating resources among the segments. The CODM evaluates segment operating performance using segment Revenue and segment Adjusted EBITDA attributable to Parsons Corporation. The following table summarizes business segment revenue for the periods presented (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Federal Solutions revenue $ 620,416 $ 499,291 $ 1,649,601 $ 1,394,035 Critical Infrastructure revenue 513,954 456,759 1,442,559 1,316,068 Total revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103 The Company defines Adjusted EBITDA attributable to Parsons Corporation as Adjusted EBITDA excluding Adjusted EBITDA attributable to noncontrolling interests. The Company defines Adjusted EBITDA as net income (loss) attributable to Parsons Corporation, adjusted to include net income (loss) attributable to noncontrolling interests and to exclude interest expense (net of interest income), provision for income taxes, depreciation and amortization and certain other items that are not considered in the evaluation of ongoing operating performance. These other items include net income (loss) attributable to noncontrolling interests, asset impairment charges, equity-based compensation, income and expense recognized on litigation matters, expenses incurred in connection with acquisitions and other non-recurring transaction costs and expenses related to our prior restructuring. The following table reconciles business segment Adjusted EBITDA attributable to Parsons Corporation to Net Income attributable to Parsons Corporation for the periods presented (in thousands): Three Months Ended Nine Months Ended Adjusted EBITDA attributable to Parsons Corporation September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Federal Solutions $ 61,004 $ 46,481 $ 151,287 $ 110,963 Critical Infrastructure 27,545 30,371 81,020 89,845 Adjusted EBITDA attributable to Parsons Corporation 88,549 76,852 232,307 200,808 Adjusted EBITDA attributable to noncontrolling interests 14,138 7,540 22,042 18,010 Depreciation and amortization (29,578 ) (37,232 ) (90,668 ) (106,540 ) Interest expense, net (5,941 ) (3,987 ) (14,168 ) (13,188 ) Income tax expense (13,792 ) (9,165 ) (27,643 ) (18,378 ) Equity-based compensation expense (7,125 ) (3,224 ) (15,814 ) (15,125 ) Transaction-related costs (a) (2,563 ) (2,537 ) (14,486 ) (9,269 ) Restructuring expense (b) - (357 ) (213 ) (507 ) Other (c) (93 ) (1,121 ) (1,139 ) (3,001 ) Net income including noncontrolling interests 43,595 26,769 90,218 52,810 Net income attributable to noncontrolling interests 14,024 7,411 21,685 17,711 Net income attributable to Parsons Corporation $ 29,571 $ 19,358 $ 68,533 $ 35,099 (a) Reflects costs incurred in connection with acquisitions and other non-recurring transaction costs, primarily fees paid for professional services and employee retention. (b) Reflects costs associated with corporate restructuring initiatives. (c) Includes a combination of gain/loss related to sale of fixed assets, software implementation costs, and other individually insignificant items that are non-recurring in nature. Asset information by segment is not a key measure of performance used by the CODM. The following tables present revenues and property and equipment, net by geographic area (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue North America $ 944,942 $ 804,122 $ 2,571,741 $ 2,245,515 Middle East 184,680 147,207 504,078 448,525 Rest of World 4,748 4,721 16,341 16,063 Total Revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103 The geographic location of revenue is determined by the location of the customer. September 30, 2022 December 31, 2021 Property and Equipment, Net North America $ 90,820 $ 100,674 Middle East 3,698 3,522 Total Property and Equipment, Net $ 94,518 $ 104,196 North America includes revenue in the United States for the three months ended September 30, 2022 and September 30, 2021 of $851.5 million and $730.7 million, respectively, and for the nine months ended September 30, 2022 and September 30, 2021 of $2.3 billion and $2.0 billion, respectively. The following table presents revenues by business units (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue Defense and Intelligence $ 351,419 $ 332,080 $ 1,037,244 $ 929,044 Engineered Systems 268,997 167,211 612,357 464,991 Federal Solutions revenues 620,416 499,291 1,649,601 1,394,035 Mobility Solutions 329,666 293,799 924,834 871,220 Connected Communities 184,288 162,960 517,725 444,848 Critical Infrastructure revenues 513,954 456,759 1,442,559 1,316,068 Total Revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103 Effective July 1, 2021, the Company made changes to its Federal Solutions business units by consolidating Space & Geospatial Solutions, Cyber & Intelligence, and Missile Defense & C5ISR into a new Defense and Intelligence business unit. Effective January 1, 2022, the Company made changes to its Critical Infrastructure business units by transferring a portion of legacy Mobility Solutions to the Connected Communities business unit. Effective June 1, 2022, the Company made changes to its Federal Solutions business units by transferring a portion of legacy Defense and Intelligence business unit to the Engineered Systems business unit. The prior year information in the table above has been reclassified to conform to the business line changes.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	19.

Basis of Presentation and Pri_2

Basis of Presentation and Principles of Consolidation (Policies)	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation and Principles of Consolidation	The accompanying unaudited consolidated financial statements and related notes of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") and pursuant to the interim period reporting requirements of Form 10-Q. They do not include all of the information and footnotes required by GAAP for complete financial statements and, therefore, should be read in conjunction with our consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. In the opinion of management, the consolidated financial statements reflect all normal recurring adjustments necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for any interim period are not necessarily indicative of results for the full year or for future years. This Quarterly Report on Form 10-Q includes the accounts of Parsons Corporation and its subsidiaries and affiliates which it controls. Interests in joint ventures that are controlled by the Company, or for which the Company is otherwise deemed to be the primary beneficiary, are consolidated. For joint ventures in which the Company does not have a controlling interest, but exerts a significant influence, the Company applies the equity method of accounting (see “Note 14 –
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from those estimates. The Company’s most significant estimates and judgments involve revenue recognition with respect to the determination of the costs to complete contracts and transaction price; determination of self-insurance reserves; useful lives of property and equipment and intangible assets; valuation of deferred income tax assets and uncertain tax positions, among others. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” and “Note 2—Summary of Significant Accounting Polices” in the notes to our consolidated financial statements included in the Company’s Form 10-K for the year ended December 31, 2021, for a discussion of the significant estimates and assumptions affecting our consolidated financial statements. Estimates of costs to complete contracts are continually evaluated as work progresses and are revised when necessary. When a change in estimate is determined to have an impact on contract profit, the Company records a positive or negative adjustment to the consolidated statement of income.
Stock Repurchase Plan	Stock Repurchase Plan During the third quarter of 2021, the Company’s Board of Directors authorized the Company to acquire a number of shares of Common Stock having an aggregate market value of not greater than $100,000,000 from time to time. Repurchased shares of common stock are retired and included in “Repurchases of common stock” in cash flows from financing activities in the Consolidated Statements of Cash Flows.
New Accounting Pronouncements	In the first quarter of 2022, the Company early adopted ASU No. 2021-08, “Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers”. The new guidance requires that the approach of ASC 606, Revenue from Contracts with Customers, should be used to measure an acquired revenue contract in a business combination. This guidance is to be applied (1) retrospectively to all business combinations for which the acquisition date occurs on or after the beginning of the fiscal year that includes the interim period of early application and (2) prospectively to all business combinations that occur on or after the date of initial application. The early adoption of ASU 2021-08 did not have a material impact on the consolidated financial statements. In the first quarter of 2021, the Company early adopted Accounting Standards Update (“ASU”) ASU 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40) (“ASU 2020-06)”. The update simplifies the accounting for convertible debt instruments and convertible preferred stock by reducing the number of accounting models and limiting the number of embedded conversion features separately recognized from the primary contract. The guidance also includes targeted improvements to the disclosures for convertible instruments and earnings per share. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020. The Company adopted ASU 2020-06 in the first quarter of 2021 using the modified retrospective method which resulted in a reduction in non-cash interest expense and reclassification of the equity portion of the Convertible Senior Notes to “Long-term debt” on the consolidated balance sheet. In the first quarter of 2021, the Company adopted ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”)”. ASU 2019-12 was issued as a means to reduce the complexity of accounting for income taxes. The guidance is to be applied using a prospective method, excluding amendments related to franchise taxes, which should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The adoption of ASU 2019-12 did not have a material impact on the consolidated financial statements.
Leases	Leases The Company has operating and finance leases for corporate and project office spaces, vehicles, heavy machinery and office equipment. Our leases have remaining lease terms of one year to 8 years, some of which may include options to extend the leases for up to five years, and some of which may include options to terminate the leases after the third year.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2022
Xator Corporation
Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed based on the preliminary purchase price allocation as of the date of acquisition (in thousands): Amount Cash and cash equivalents $ 8,935 Accounts receivable 28,199 Contract assets 4,591 Prepaid expenses and other current assets 3,615 Property and equipment 1,699 Right of use assets, operating leases 7,517 Goodwill 252,994 Investments in and advances to unconsolidated joint ventures 698 Intangible assets 123,500 Other noncurrent assets 9,156 Accounts payable (6,626 ) Accrued expenses and other current liabilities (31,119 ) Contract liabilities (2,080 ) Short-term lease liabilities, operating leases (2,371 ) Long-term lease liabilities, operating leases (5,146 ) Other long-term liabilities (9,156 ) Net assets acquired $ 384,406
Schedule of Preliminary Intangible Assets Value on Purchase Price	Of the total purchase price, the following values were preliminarily assigned to intangible assets (in thousands, except for years): Gross Carrying Amount Amortization Period (in years) Customer relationships $ 37,000 15 Backlog 81,000 6 Trade Name 4,000 1 Developed technologies 1,000 3 Non-compete agreements 500 3
Schedule of Supplemental Pro Forma Information	Supplemental information of unaudited pro forma operating results assuming the Xator acquisition had been consummated as of the beginning of fiscal year 2021 (in thousands) is as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Pro forma Revenue $ 1,134,370 $ 1,027,430 $ 3,199,336 $ 2,920,933 Pro forma Net Income including noncontrolling interests 43,970 28,878 $ 102,860 $ 49,609
BlackHorse Solutions, Inc.
Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed based on the purchase price allocation as of the date of acquisition (in thousands): Amount Cash and cash equivalents $ 15,428 Accounts receivable 3,351 Contract assets 5,979 Prepaid expenses and other current assets 937 Property and equipment 2,239 Right of use assets, operating leases 6,157 Goodwill 143,086 Intangible assets 65,000 Accounts payable (2,326 ) Accrued expenses and other current liabilities (17,190 ) Contract liabilities (320 ) Short-term lease liabilities, operating leases (1,011 ) Long-term lease liabilities, operating leases (5,146 ) Deferred tax liabilities (10,916 ) Other long-term liabilities (235 ) Net assets acquired $ 205,033
Schedule of Preliminary Intangible Assets Value on Purchase Price	Of the total purchase price, the following values were assigned to intangible assets (in thousands, except for years): Gross Carrying Amount Amortization Period (in years) Customer relationships $ 39,000 16 Backlog 23,000 3 Trade name 1,000 2 Developed technologies 1,000 3 Non-compete agreements 1,000 3
Schedule of Supplemental Pro Forma Information	Supplemental information of unaudited pro forma operating results assuming the BlackHorse acquisition had been consummated as of the beginning of fiscal year 2020 (in thousands) is as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Pro forma Revenue $ 1,134,370 $ 957,498 $ 3,092,160 $ 2,748,559 Pro forma Net Income including noncontrolling interests 44,766 30,608 95,299 $ 56,232

Contracts with Customers (Table

Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2022
Revenue From Contract With Customer [Abstract]
Summary of Disaggregation of Revenue	The Company’s contracts contain both fixed-price and cost reimbursable components. Contract types are based on the component that represents the majority of the contract. The following table presents revenue disaggregated by contract type (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Fixed-Price $ 334,853 $ 246,894 $ 854,835 $ 710,067 Time-and-Materials 302,236 261,566 836,881 754,596 Cost-Plus 497,281 447,590 1,400,444 1,245,440 Total $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103
Summary of Contract Assets and Contract Liabilities	Contract assets and contract liabilities balances at September 30, 2022 and December 31, 2021 were as follows (in thousands): September 30, 2022 December 31, 2021 $ change % change Contract assets $ 642,264 $ 579,216 $ 63,048 10.9 % Contract liabilities 197,749 171,671 26,078 15.2 % Net contract assets (liabilities) (1) $ 444,515 $ 407,545 $ 36,970 9.1 % (1) Total contract retentions included in net contract assets (liabilities) were $74.2 million
Summary of Changes in Contract Assets and Contract Liabilities	Certain changes in contract assets and contract liabilities consisted of the following: September 30, 2022 December 31, 2021 Acquired contract assets $ 4,591 $ 5,979 Acquired contract liabilities 2,080 320
Summary of Changes in Revenue	Revisions in estimates, such as changes in estimated claims or incentives, related to performance obligations partially satisfied in previous periods that individually had an impact of $5 million or more on revenue resulted in the following changes in revenue: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue impact, net $ - $ (6,300 ) $ - $ (27,553 )
Summary of Accounts Receivable, Net	Accounts receivable, net consisted of the following as of September 30, 2022 and December 31, 2021 (in thousands): 2022 2021 Billed $ 487,221 $ 434,776 Unbilled 227,453 167,490 Total accounts receivable, gross 714,674 602,266 Allowance for doubtful accounts (3,953 ) (3,955 ) Total accounts receivable, net $ 710,721 $ 598,311
Summary of Remaining Unsatisfied Performance Obligations Expect to Satisfy	The Company expects to satisfy its RUPO as of September 30, 2022 over the following periods (in thousands): Period RUPO Will Be Satisfied Within One Year Within One to Two Years Thereafter Federal Solutions $ 1,598,275 $ 638,502 $ 252,481 Critical Infrastructure 1,532,842 895,714 894,720 Total $ 3,131,117 $ 1,534,216 $ 1,147,201

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Summary of Lease Costs	The components of lease costs for the three and nine months ended September 30, 2022 and September 30, 2021 are as follows (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Operating lease cost $ 16,299 $ 16,900 $ 49,049 $ 49,500 Short-term lease cost 3,858 3,661 10,948 7,859 Amortization of right-of-use assets 571 540 1,721 1,557 Interest on lease liabilities 24 24 67 81 Sublease income (1,318 ) (960 ) (3,321 ) (2,529 ) Total lease cost $ 19,434 $ 20,165 $ 58,464 $ 56,468
Schedule of Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases for the three months ended September 30, 2022 and September 30, 2021 is as follows (in thousands): Nine Months Ended September 30, 2022 September 30, 2021 Operating cash flows for operating leases $ 51,988 $ 50,029 Operating cash flows for finance leases 67 82 Financing cash flows from finance leases 1,580 1,539 Right-of-use assets obtained in exchange for new operating lease liabilities 15,709 7,456 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1,156 $ 619
Schedule of Supplemental Balance Sheet and Other Information Related to Leases	Supplemental balance sheet and other information related to leases as of September 30, 2022 and December 31, 2021 are as follows (in thousands): September 30, 2022 December 31, 2021 Operating Leases: Right-of-use assets $ 161,602 $ 182,672 Lease liabilities: Current $ 59,056 $ 55,902 Long-term 121,172 148,893 Total operating lease liabilities $ 180,228 $ 204,795 Finance Leases: Other noncurrent assets $ 3,829 $ 4,389 Accrued expenses and other current liabilities $ 1,707 $ 1,822 Other long-term liabilities $ 2,117 $ 2,422 Weighted Average Remaining Lease Term: Operating leases 3.8 Years 4.3 years Finance leases 2.6 Years 2.9 years Weighted Average Discount Rate: Operating leases 3.4 % 3.5 % Finance leases 2.4 % 2.1 %
Schedule of Maturity Analysis of Future Undiscounted Cash Flows	A maturity analysis of the future undiscounted cash flows associated with the Company’s operating and finance lease liabilities as of September 30, 2022 is as follows (in thousands): Operating Leases Finance Leases 2022 (remaining) $ 18,562 $ 495 2023 59,464 1,590 2024 44,371 1,067 2025 33,246 676 2026 19,366 103 Thereafter 17,204 - Total lease payments 192,213 3,931 Less: imputed interest (11,985 ) (107 ) Total present value of lease liabilities $ 180,228 $ 3,824

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Value of Goodwill by Reporting Segment	The following table summarizes the changes in the carrying value of goodwill by reporting segment from December 31, 2021 to September 30, 2022 (in thousands): December 31, 2021 Acquisitions Foreign Exchange September 30, 2022 Federal Solutions $ 1,339,117 $ 252,250 $ - $ 1,591,367 Critical Infrastructure 73,573 - (3,833 ) 69,740 Total $ 1,412,690 $ 252,250 $ (3,833 ) $ 1,661,107

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Gross Amount and Accumulated Amortization of Intangible Assets	The gross amount and accumulated amortization of intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets are as follows (in thousands except for years): September 30, 2022 December 31, 2021 Weighted Average Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortization Period (in years) Backlog $ 251,455 $ (146,432 ) $ 105,023 $ 169,455 $ (126,637 ) $ 42,818 4 Customer relationships 338,829 (182,689 ) 156,140 301,829 (158,405 ) 143,424 9 Leases 670 (632 ) 38 670 (618 ) 52 5 Developed technology 114,939 (109,135 ) 5,804 113,939 (96,765 ) 17,174 4 Trade name 13,200 (10,158 ) 3,042 9,200 (8,444 ) 756 1 Non-compete agreements 5,750 (4,221 ) 1,529 5,250 (3,523 ) 1,727 3 In process research and development 1,800 - 1,800 1,800 - 1,800 n/a Other intangibles 275 (209 ) 66 275 (205 ) 70 10 Total intangible assets $ 726,918 $ (453,476 ) $ 273,442 $ 602,418 $ (394,597 ) $ 207,821
Schedule of Estimated Amortization Expense	Estimated amortization expense for the remainder of the current fiscal year and in each of the next four years and beyond is as follows (in thousands): September 30, 2022 2022 $ 19,314 2023 68,256 2024 35,359 2025 29,818 2026 26,238 Thereafter 92,657 Total $ 271,642

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment consisted of the following at September 30, 2022 and December 31, 2021 (in thousands): September 30, 2022 December 31, 2021 Useful life (years) Buildings and leasehold improvements $ 102,527 $ 99,543 1-15 Furniture and equipment 87,685 86,862 3-10 Computer systems and equipment 160,583 157,633 3-10 Construction equipment 6,190 6,806 5-7 Construction in progress 14,895 12,970 371,880 363,814 Accumulated depreciation (277,362 ) (259,618 ) Property and equipment, net $ 94,518 $ 104,196

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Schedule of Debt	Debt consisted of the following (in thousands): September 30, 2022 December 31, 2021 Long-Term: Revolving credit facility $ 101,200 $ - Senior notes 200,000 200,000 Convertible senior notes 400,000 400,000 Debt issuance costs (6,482 ) (8,078 ) Total long-term 694,718 591,922 Total Debt $ 694,718 $ 591,922
Schedule of Aggregate Amount of Debt	On July 1, 2014, the Company finalized a private placement whereby the Company raised an aggregate amount of $250.0 million in debt as follows (in thousands): Tranche Debt Amount Maturity Date Interest Rates Senior Note, Series A $ 50,000 July 15, 2021 4.44 % Senior Note, Series B 100,000 July 15, 2024 4.98 % Senior Note, Series C 60,000 July 15, 2026 5.13 % Senior Note, Series D 40,000 July 15, 2029 5.38 %

Investments in and Advances t_2

Investments in and Advances to Joint Ventures (Tables)	9 Months Ended
	Sep. 30, 2022
Equity Method Investments And Joint Ventures [Abstract]
Schedule of Financial Information of Consolidated Joint Ventures	The following represents financial information for consolidated joint ventures included in the consolidated financial statements (in thousands): September 30, 2022 December 31, 2021 Current assets $ 268,561 $ 246,342 Noncurrent assets 7,885 2,180 Total assets 276,446 248,522 Current liabilities 169,233 175,637 Total liabilities 169,233 175,637 Total joint venture equity $ 107,213 $ 72,885 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue $ 130,344 $ 101,816 $ 333,967 $ 296,685 Costs 101,882 86,726 289,485 260,129 Net income $ 28,462 $ 15,090 $ 44,482 $ 36,556 Net income attributable to noncontrolling interests $ 14,024 $ 7,411 $ 21,685 $ 17,711
Summary of Financial Information for Unconsolidated Joint Ventures	The following represents the financial information of the Company’s unconsolidated joint ventures as presented in their unaudited financial statements (in thousands): September 30, 2022 December 31, 2021 Current assets $ 1,770,762 $ 1,620,735 Noncurrent assets 487,823 531,261 Total assets 2,258,585 2,151,996 Current liabilities 1,357,131 1,088,985 Noncurrent liabilities 467,030 669,911 Total liabilities 1,824,161 1,758,896 Total joint venture equity $ 434,424 $ 393,100 Investments in and advances to unconsolidated joint ventures $ 99,424 $ 110,688 Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue $ 782,880 $ 728,461 $ 1,762,420 $ 1,701,262 Costs 774,030 697,493 1,711,555 1,604,538 Net income $ 8,850 $ 30,968 $ 50,865 $ 96,724 Equity in earnings of unconsolidated joint ventures $ (974 ) $ 9,570 $ 10,237 $ 26,528

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2022
Related Party Transactions [Abstract]
Schedule of Consolidated Balance Sheet Related to Services Provided to Unconsolidated Joint Ventures	Amounts included in the consolidated balance sheets related to services the Company provided to unconsolidated joint ventures are as follows (in thousands): September 30, 2022 December 31, 2021 Accounts receivable $ 37,657 $ 30,246 Contract assets 27,037 16,069 Contract liabilities 12,642 10,605

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares Used To Compute Basic and Diluted EPS	The weighted average number of shares used to compute basic and diluted EPS were: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Basic weighted average number of shares outstanding 103,608,135 102,478,095 103,684,048 102,463,511 Stock-based awards 918,090 751,807 746,702 637,686 Convertible senior notes 8,916,530 8,916,530 8,916,530 8,916,530 Diluted weighted average number of shares outstanding 113,442,755 112,146,432 113,347,280 112,017,727
Net Income Available to Shareholders to Compute Basic and Diluted EPS	The net income available to shareholders to compute basic and diluted EPS were (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Net income attributable to Parsons Corporation 29,571 19,358 68,533 35,099 Convertible senior notes if-converted method interest adjustment 545 534 1,627 1,593 Diluted net income attributable to Parsons Corporation 30,116 19,892 70,160 36,692
Schedule of Repurchase Program	The table below presents information on this repurchase program: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Total shares repurchased 95,413 245,000 522,501 245,000 Total shares retired 95,413 245,000 522,501 245,000 Average price paid per share $ 41.42 $ 35.51 $ 37.32 $ 35.51

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Summary of Business Segment Information	The following table summarizes business segment revenue for the periods presented (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Federal Solutions revenue $ 620,416 $ 499,291 $ 1,649,601 $ 1,394,035 Critical Infrastructure revenue 513,954 456,759 1,442,559 1,316,068 Total revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103
Summary of Adjusted EBITDA Business Segment Information	The following table reconciles business segment Adjusted EBITDA attributable to Parsons Corporation to Net Income attributable to Parsons Corporation for the periods presented (in thousands): Three Months Ended Nine Months Ended Adjusted EBITDA attributable to Parsons Corporation September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Federal Solutions $ 61,004 $ 46,481 $ 151,287 $ 110,963 Critical Infrastructure 27,545 30,371 81,020 89,845 Adjusted EBITDA attributable to Parsons Corporation 88,549 76,852 232,307 200,808 Adjusted EBITDA attributable to noncontrolling interests 14,138 7,540 22,042 18,010 Depreciation and amortization (29,578 ) (37,232 ) (90,668 ) (106,540 ) Interest expense, net (5,941 ) (3,987 ) (14,168 ) (13,188 ) Income tax expense (13,792 ) (9,165 ) (27,643 ) (18,378 ) Equity-based compensation expense (7,125 ) (3,224 ) (15,814 ) (15,125 ) Transaction-related costs (a) (2,563 ) (2,537 ) (14,486 ) (9,269 ) Restructuring expense (b) - (357 ) (213 ) (507 ) Other (c) (93 ) (1,121 ) (1,139 ) (3,001 ) Net income including noncontrolling interests 43,595 26,769 90,218 52,810 Net income attributable to noncontrolling interests 14,024 7,411 21,685 17,711 Net income attributable to Parsons Corporation $ 29,571 $ 19,358 $ 68,533 $ 35,099 (a) Reflects costs incurred in connection with acquisitions and other non-recurring transaction costs, primarily fees paid for professional services and employee retention. (b) Reflects costs associated with corporate restructuring initiatives. (c) Includes a combination of gain/loss related to sale of fixed assets, software implementation costs, and other individually insignificant items that are non-recurring in nature.
Summary of Revenues and Property and Equipment, Net by Geographic Area	The following tables present revenues and property and equipment, net by geographic area (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue North America $ 944,942 $ 804,122 $ 2,571,741 $ 2,245,515 Middle East 184,680 147,207 504,078 448,525 Rest of World 4,748 4,721 16,341 16,063 Total Revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103 The geographic location of revenue is determined by the location of the customer. September 30, 2022 December 31, 2021 Property and Equipment, Net North America $ 90,820 $ 100,674 Middle East 3,698 3,522 Total Property and Equipment, Net $ 94,518 $ 104,196
Summary of Revenues by Business Lines	The following table presents revenues by business units (in thousands): Three Months Ended Nine Months Ended September 30, 2022 September 30, 2021 September 30, 2022 September 30, 2021 Revenue Defense and Intelligence $ 351,419 $ 332,080 $ 1,037,244 $ 929,044 Engineered Systems 268,997 167,211 612,357 464,991 Federal Solutions revenues 620,416 499,291 1,649,601 1,394,035 Mobility Solutions 329,666 293,799 924,834 871,220 Connected Communities 184,288 162,960 517,725 444,848 Critical Infrastructure revenues 513,954 456,759 1,442,559 1,316,068 Total Revenue $ 1,134,370 $ 956,050 $ 3,092,160 $ 2,710,103

Basis of Presentation and Pri_3

Basis of Presentation and Principles of Consolidation - Additional Information (Details)	Sep. 30, 2021 USD ($)
Maximum
Basis Of Presentation And Principles Of Consolidation Disclosure [Line Items]
Number of authorized shares of common stock value	$ 100,000,000

New Accounting Pronouncements -

New Accounting Pronouncements - Additional Information (Details)	Sep. 30, 2022
ASU 2020-06
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle, accounting standards update, early adoption	true
Change in accounting principle, accounting standards update, immaterial effect	false
ASU 2021-08
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2022
Change in accounting principle, accounting standards update, early adoption	true
Change in accounting principle, accounting standards update, immaterial effect	true
ASU 2019-12
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect	true
Change in accounting principle, accounting standards update, adopted	true

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	May 31, 2022	Jul. 30, 2021	Jul. 06, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Business Acquisition [Line Items]
Amortization of intangible assets				$ 19,100	$ 27,000	$ 58,900	$ 76,100
Revenues				1,134,370	956,050	3,092,160	2,710,103
Goodwill				1,661,107		1,661,107		$ 1,412,690
Xator Corporation
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100%
Cash paid to acquire	$ 388,300
Borrowed under credit agreement to partially fund the acquisition	300,000
Amortization of intangible assets				4,900		6,600
Revenues				70,400		91,200
Goodwill	$ 252,994
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Percentage of ownership interest acquired			100%
Cash paid to acquire			$ 205,000
Amortization of intangible assets				3,500		10,600
Revenues				$ 22,600	$ 16,700	$ 66,300	$ 16,700
Goodwill deductible for tax purposes			10,600
Goodwill			$ 143,086
Echo Ridge LLC
Business Acquisition [Line Items]
Percentage of ownership interest acquired		100%
Cash paid to acquire		$ 9,000
Goodwill		$ 7,200

Acquisitions - Summary of Estim

Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2022	May 31, 2022	Dec. 31, 2021	Jul. 06, 2021
Business Acquisition [Line Items]
Contract assets	$ 642,264		$ 579,216
Goodwill	1,661,107		1,412,690
Investments in and advances to unconsolidated joint ventures	99,424		110,688
Contract liabilities	$ (197,749)		$ (171,671)
Xator Corporation
Business Acquisition [Line Items]
Cash and cash equivalents		$ 8,935
Accounts receivable		28,199
Contract assets		4,591
Prepaid expenses and other current assets		3,615
Property and equipment		1,699
Right of use assets, operating leases		7,517
Goodwill		252,994
Investments in and advances to unconsolidated joint ventures		698
Intangible assets		123,500
Other noncurrent assets		9,156
Accounts payable		(6,626)
Accrued expenses and other current liabilities		(31,119)
Contract liabilities		(2,080)
Short-term lease liabilities, operating leases		(2,371)
Long-term lease liabilities, operating leases		(5,146)
Other long-term liabilities		(9,156)
Net assets acquired		$ 384,406
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents				$ 15,428
Accounts receivable				3,351
Contract assets				5,979
Prepaid expenses and other current assets				937
Property and equipment				2,239
Right of use assets, operating leases				6,157
Goodwill				143,086
Intangible assets				65,000
Accounts payable				(2,326)
Accrued expenses and other current liabilities				(17,190)
Contract liabilities				(320)
Short-term lease liabilities, operating leases				(1,011)
Long-term lease liabilities, operating leases				(5,146)
Deferred tax liabilities				(10,916)
Other long-term liabilities				(235)
Net assets acquired				$ 205,033

Acquisitions - Schedule of Prel

Acquisitions - Schedule of Preliminary Intangible Assets Value on Purchase Price (Details) - USD ($) $ in Thousands		9 Months Ended
	May 31, 2022	Sep. 30, 2022
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		9 years
Customer Relationships | Xator Corporation
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 37,000
Amortization Period (in years)	14 years
Backlog
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		4 years
Backlog | Xator Corporation
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 81,000
Amortization Period (in years)	3 years
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		1 year
Trade Names | Xator Corporation
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,000
Amortization Period (in years)	1 year
Developed Technologies
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		4 years
Developed Technologies | Xator Corporation
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,000
Amortization Period (in years)	4 years
Non compete Agreements
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		3 years
Non compete Agreements | Xator Corporation
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 500
Amortization Period (in years)	3 years

Acquisitions - Schedule of Supp

Acquisitions - Schedule of Supplemental Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Xator Corporation
Business Acquisition [Line Items]
Pro forma Revenue	$ 1,134,370	$ 1,027,430	$ 3,199,336	$ 2,920,933
Pro forma Net Income including noncontrolling interests	43,970	28,878	102,860	49,609
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Pro forma Revenue	1,134,370	957,498	3,092,160	2,748,559
Pro forma Net Income including noncontrolling interests	$ 44,766	$ 30,608	$ 95,299	$ 56,232

Acquisitions - Schedule of Inta

Acquisitions - Schedule of Intangible Assets Value on Purchase Price (Details) - USD ($) $ in Thousands		9 Months Ended
	Jul. 06, 2021	Sep. 30, 2022
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		9 years
Customer Relationships | BlackHorse Solutions, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 39,000
Amortization Period (in years)	16 years
Backlog
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		4 years
Backlog | BlackHorse Solutions, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 23,000
Amortization Period (in years)	3 years
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		1 year
Trade Names | BlackHorse Solutions, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,000
Amortization Period (in years)	2 years
Developed Technologies
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		4 years
Developed Technologies | BlackHorse Solutions, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,000
Amortization Period (in years)	3 years
Non compete Agreements
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Period (in years)		3 years
Non compete Agreements | BlackHorse Solutions, Inc.
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,000
Amortization Period (in years)	3 years

Contracts with Customers - Summ

Contracts with Customers - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenues	334,853	246,894	854,835	710,067
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenues	302,236	261,566	836,881	754,596
Cost-Plus
Disaggregation Of Revenue [Line Items]
Revenues	$ 497,281	$ 447,590	$ 1,400,444	$ 1,245,440

Contracts with Customers - Su_2

Contracts with Customers - Summary of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Revenue From Contract With Customer [Abstract]
Contract assets	$ 642,264	$ 579,216
Contract liabilities	197,749	171,671
Net contract assets (liabilities)	444,515	$ 407,545
Change in contract assets	63,048
Change in contract liabilities	26,078
Change in contract assets and liabilities	$ 36,970
Percentage change in contract assets	10.90%
Percentage change in contract liabilities	15.20%
Percentage change in contract assets and liabilities	9.10%

Contracts with Customers - Su_3

Contracts with Customers - Summary of Contract Assets and Contract Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Revenue From Contract With Customer [Abstract]
Contract retentions	$ 74.2	$ 91.7
Contract retentions, not expected to be paid in next 12 months	40.5
Contract assets, unapproved change orders, claims, and requests	$ 102.2	$ 98.6

Contracts with Customers - Addi

Contracts with Customers - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue recognized included contract liability	$ 10,100,000	$ 3,000,000	$ 91,800,000	$ 95,500,000
Impairment of contract assets			0	$ 0
Impact of changes in estimated claims or incentives on revenue			5,000,000
Remaining unsatisfied performance obligations	$ 5,800,000,000		$ 5,800,000,000

Contracts with Customers - Su_4

Contracts with Customers - Summary of Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Revenue From Contract With Customer [Abstract]
Acquired contract assets	$ 4,591	$ 5,979
Acquired contract liabilities	$ 2,080	$ 320

Contracts with Customers - Su_5

Contracts with Customers - Summary of Changes in Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue impact, net	$ (6,300)	$ (27,553)

Contracts with Customers - Su_6

Contracts with Customers - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Revenue From Contract With Customer [Abstract]
Billed	$ 487,221	$ 434,776
Unbilled	227,453	167,490
Total accounts receivable, gross	714,674	602,266
Allowance for doubtful accounts	(3,953)	(3,955)
Total accounts receivable, net	$ 710,721	$ 598,311

Contracts with Customers - Su_7

Contracts with Customers - Summary of Remaining Unsatisfied Performance Obligations Expect to Satisfy (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 5,800,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 3,131,117
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 1,534,216
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 1,147,201
Revenue, remaining performance obligation, expected timing of satisfaction, period
Federal Solution Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 1,598,275
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Federal Solution Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 638,502
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Federal Solution Segment | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 252,481
Revenue, remaining performance obligation, expected timing of satisfaction, period
Critical Infrastructure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 1,532,842
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Critical Infrastructure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 895,714
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Critical Infrastructure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Remaining unsatisfied performance obligations	$ 894,720
Revenue, remaining performance obligation, expected timing of satisfaction, period

Leases - Additional Information

Leases - Additional Information (Details)	9 Months Ended
	Sep. 30, 2022 USD ($)
Lessee Lease Description [Line Items]
Lease option to extend	five years
Lease existence of option to extend	true
Lease option to terminate	third year
Lease existence of option to terminate	true
Operating lease not yet commenced expense	$ 0
Minimum
Lessee Lease Description [Line Items]
Lease term of contract	1 year
Maximum
Lessee Lease Description [Line Items]
Lease term of contract	8 years

Leases - Summary of Lease Costs

Leases - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating lease cost	$ 16,299	$ 16,900	$ 49,049	$ 49,500
Short-term lease cost	3,858	3,661	10,948	7,859
Amortization of right-of-use assets	571	540	1,721	1,557
Interest on lease liabilities	24	24	67	81
Sublease income	(1,318)	(960)	(3,321)	(2,529)
Total lease cost	$ 19,434	$ 20,165	$ 58,464	$ 56,468

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating cash flows for operating leases	$ 51,988	$ 50,029
Operating cash flows for finance leases	67	82
Financing cash flows from finance leases	1,580	1,539
Right-of-use assets obtained in exchange for new operating lease liabilities	15,709	7,456
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 1,156	$ 619

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Balance Sheet and Other Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Operating Leases:
Right-of-use assets	$ 161,602	$ 182,672
Lease liabilities:
Current	59,056	55,902
Long-term	121,172	148,893
Total operating lease liabilities	180,228	204,795
Finance Leases:
Other noncurrent assets	3,829	4,389
Accrued expenses and other current liabilities	$ 1,707	$ 1,822
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other liabilities current	Other liabilities current
Other long-term liabilities	$ 2,117	$ 2,422
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities
Weighted Average Remaining Lease Term:
Operating leases	3 years 9 months 18 days	4 years 3 months 18 days
Finance leases	2 years 7 months 6 days	2 years 10 months 24 days
Weighted Average Discount Rate:
Operating leases	3.40%	3.50%
Finance leases	2.40%	2.10%

Leases - Schedule of Maturity A

Leases - Schedule of Maturity Analysis of Future Undiscounted Cash Flows (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Operating Leases
2022 (remaining)	$ 18,562
2023	59,464
2024	44,371
2025	33,246
2026	19,366
Thereafter	17,204
Total lease payments	192,213
Less: imputed interest	(11,985)
Total present value of lease liabilities	180,228	$ 204,795
Finance Leases
2022 (remaining)	495
2023	1,590
2024	1,067
2025	676
2026	103
Thereafter	0
Total lease payments	3,931
Less: imputed interest	(107)
Total present value of lease liabilities	$ 3,824

Goodwill - Summary of Changes i

Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 1,412,690
Acquisitions	252,250
Foreign Exchange	(3,833)
Ending Balance	1,661,107
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,339,117
Acquisitions	252,250
Ending Balance	1,591,367
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	73,573
Foreign Exchange	(3,833)
Ending Balance	$ 69,740

Goodwill - Additional Informati

Goodwill - Additional Information (Details)	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0

Intangible Assets - Schedule of

Intangible Assets - Schedule of Gross Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 726,918	$ 602,418
Accumulated Amortization	(453,476)	(394,597)
Net Carrying Amount	273,442	207,821
Backlog
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	251,455	169,455
Accumulated Amortization	(146,432)	(126,637)
Net Carrying Amount	$ 105,023	42,818
Amortization Period (in years)	4 years
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 338,829	301,829
Accumulated Amortization	(182,689)	(158,405)
Net Carrying Amount	$ 156,140	143,424
Amortization Period (in years)	9 years
Leases
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 670	670
Accumulated Amortization	(632)	(618)
Net Carrying Amount	$ 38	52
Amortization Period (in years)	5 years
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 114,939	113,939
Accumulated Amortization	(109,135)	(96,765)
Net Carrying Amount	$ 5,804	17,174
Amortization Period (in years)	4 years
Trade Name
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,200	9,200
Accumulated Amortization	(10,158)	(8,444)
Net Carrying Amount	$ 3,042	756
Amortization Period (in years)	1 year
Non compete Agreements
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,750	5,250
Accumulated Amortization	(4,221)	(3,523)
Net Carrying Amount	$ 1,529	1,727
Amortization Period (in years)	3 years
In Process Research and Development
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,800	1,800
Accumulated Amortization	0	0
Net Carrying Amount	1,800	1,800
Other Intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	275	275
Accumulated Amortization	(209)	(205)
Net Carrying Amount	$ 66	$ 70
Amortization Period (in years)	10 years

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 19.1	$ 27	$ 58.9	$ 76.1

Intangible Assets - Schedule _2

Intangible Assets - Schedule of Estimated Amortization Expense (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2022	$ 19,314
2023	68,256
2024	35,359
2025	29,818
2026	26,238
Thereafter	92,657
Finite-Lived Intangible Assets, Net	$ 271,642

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 371,880	$ 363,814
Accumulated depreciation	(277,362)	(259,618)
Property and equipment, net	94,518	104,196
Buildings and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 102,527	99,543
Buildings and Leasehold Improvements | Minimum
Property Plant And Equipment [Line Items]
Useful life (years)	1 year
Buildings and Leasehold Improvements | Maximum
Property Plant And Equipment [Line Items]
Useful life (years)	15 years
Furniture and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 87,685	86,862
Furniture and Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life (years)	3 years
Furniture and Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life (years)	10 years
Computer Systems and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 160,583	157,633
Computer Systems and Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life (years)	3 years
Computer Systems and Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life (years)	10 years
Construction Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 6,190	6,806
Construction Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life (years)	5 years
Construction Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life (years)	7 years
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 14,895	$ 12,970

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property Plant And Equipment [Abstract]
Depreciation expense	$ 9.7	$ 9.6	$ 29.3	$ 28.8

Debt and Credit Facilities - Sc

Debt and Credit Facilities - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Convertible senior notes	$ 400,000	$ 400,000
Long-term debt issuance costs	(6,482)	(8,078)
Total long-term	694,718	591,922
Total Debt	694,718	591,922
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	101,200	0
Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 200,000	$ 200,000

Debt and Credit Facilities - Ad

Debt and Credit Facilities - Additional Information (Details)			1 Months Ended				3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	May 31, 2022 USD ($)	Jul. 01, 2014 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) Extension	Aug. 31, 2020 USD ($) d	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) d $ / shares shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Aug. 10, 2020 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding amount			$ 239,800,000				$ 239,800,000			$ 239,800,000			$ 223,000,000
Deferred tax liabilities			10,409,000				10,409,000			10,409,000			11,400,000
Deferred tax assets			139,890,000				139,890,000			139,890,000			134,393,000
Level 2
Debt Instrument [Line Items]
Senior notes, fair value			203,500,000				203,500,000			203,500,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, outstanding amount			200,000,000				200,000,000			200,000,000			200,000,000
Senior Note, Series A
Debt Instrument [Line Items]
Senior note, amount paid				$ 50,000,000
Convertible Senior Notes
Debt Instrument [Line Items]
Debt amount						$ 400,000,000
Interest rate						0.25%
Interest expense							700,000	$ 700,000		$ 2,200,000	$ 2,200,000	$ 4,400,000
Exercise of option by initial purchasers aggregate principal amount						$ 50,000,000
Proceeds from issuance and sale of debt						389,700,000
Transaction fees and other third-party offering expenses						$ 10,300,000
Debt instrument, payment terms										The Convertible Senior Notes accrue interest at a rate of 0.25% per annum, payable semi-annually on February 15 and August 15 of each year beginning on February 15, 2021
Debt instrument, frequency of periodic payment										semi-annually
Maturity Date						Aug. 15, 2025
Convertible note converted each amount			$ 1,000				$ 1,000			$ 1,000
Convertible notes converted each into shares of common stock | shares										22.2913
Debt Instrument, conversion price | $ / shares			$ 44.86				$ 44.86			$ 44.86
Threshold trading days | d						20				51
Threshold consecutive trading days | d						30
Conversion percentage of stock price trigger						130%
Number of business day period						5 days
Consecutive trading day period						5 days
Convertible principal amount						$ 1,000
Measurement period, percentage						98%
Percentage of principal amount to redeem convertible senior notes						100%
Percentage of convertible senior notes repurchased at cash						100%
Debt liability						$ 336,100,000
Debt instrument convertible notes additional paid in capital						$ 53,600,000
Convertible senior notes effective interest rate						3.25%
Net carrying value of notes			$ 400,000,000				$ 400,000,000			$ 400,000,000		$ 340,600,000	400,000,000
Bond hedge term										5 years
Number of shares issuable upon conversion | shares										8,900,000
Cost of convertible note hedge transaction										$ 55,000,000
Number of common stock acquired by offsetting sale warrants. | shares										8,900,000
Exercise price of warrants | $ / shares			$ 66.46				$ 66.46			$ 66.46
Cash proceeds from sales of warrants										$ 13,800,000
Convertible Senior Notes | ASU 2020-06
Debt Instrument [Line Items]
Reclassification of equity component of convertible senior notes to liabilities														$ 55,000,000
Reclassification of equity component of debt issuance costs to liabilities														$ 1,400,000
Carrying amount of convertible senior notes adjusted in retained earnings															$ 3,700,000
Convertible Note Hedge And Warrant Transaction
Debt Instrument [Line Items]
Purchase of bond hedges and sale of warrants			$ 41,200,000				$ 41,200,000			41,200,000
Deferred tax liabilities			16,200,000				16,200,000			16,200,000
Deferred tax assets			16,500,000				16,500,000			16,500,000
Convertible Note Hedge And Warrant Transaction | ASU 2020-06
Debt Instrument [Line Items]
Deferred tax liability reversed			13,900,000				13,900,000			13,900,000
Additional deferred tax liability related to capitalized debt issuance costs			400,000				400,000			400,000
Adjustment to deferred tax asset through retained earnings			900,000				900,000			900,000
Private Placement
Debt Instrument [Line Items]
Debt amount		$ 250,000,000
Debt issuance costs incurred		1,100,000														$ 500,000
Interest payments							5,100,000	6,200,000		10,200,000	12,400,000
Private Placement | Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Interest payable			$ 2,200,000				2,200,000			2,200,000			$ 4,700,000
Private Placement | Senior Notes
Debt Instrument [Line Items]
Interest expense							$ 2,600,000	2,700,000		$ 7,800,000	8,900,000
Private Placement | Senior Note, Series A
Debt Instrument [Line Items]
Debt amount		$ 50,000,000
Maturity Date		Jul. 15, 2021
Xator Corporation
Debt Instrument [Line Items]
Borrowed under credit agreement to partially fund the acquisition	$ 300,000,000
Minimum | Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares			$ 44.86				$ 44.86			$ 44.86
Percentage of bond hedge and warrant transactions increased conversion price										35%
Maximum | Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, conversion price | $ / shares			$ 66.46				$ 66.46			$ 66.46
Percentage of bond hedge and warrant transactions increased conversion price										100%
2022 Delayed Draw Term Loan
Debt Instrument [Line Items]
Debt issuance date			Sep. 30, 2022
Debt amount			$ 350,000,000				$ 350,000,000			$ 350,000,000
Debt issuance costs incurred			900,000				900,000			900,000
Debt instrument, outstanding amount			$ 0				$ 0			$ 0
Debt instrument, maturity period			3 years
Unused term loan commitments rate			0.175%
2022 Delayed Draw Term Loan | Maximum
Debt Instrument [Line Items]
Increase in term loan			$ 150,000,000
2022 Delayed Draw Term Loan | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate			0%
2022 Delayed Draw Term Loan | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate			0.50%
2022 Delayed Draw Term Loan | SOFR Benchmark Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate			0.875%
2022 Delayed Draw Term Loan | SOFR Benchmark Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate			1.50%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement date					Jun. 30, 2021
Revolving credit facility					$ 650,000,000				$ 650,000,000
Debt issuance costs incurred					1,900,000				1,900,000
Revolving credit facility					$ 550,000,000				$ 550,000,000
Credit agreement maturity period					5 years
Credit agreement number of extensions | Extension					2
Interest rate			4.46%				4.46%			4.46%			1.36%
Letters of credit outstanding amount			$ 44,500,000				$ 44,500,000			$ 44,500,000			$ 44,300,000
Interest expense							2,500,000	$ 100,000		3,400,000	$ 600,000
Debt instrument, outstanding amount			$ 101,200,000				$ 101,200,000			$ 101,200,000
Unsecured Revolving Credit Facility | Xator Corporation
Debt Instrument [Line Items]
Borrowed under credit agreement to partially fund the acquisition	$ 300,000,000
Unsecured Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate									0%
Unsecured Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate									0.625%
Unsecured Revolving Credit Facility | SOFR Benchmark Rate | Minimum
Debt Instrument [Line Items]
Margin interest rate									1%
Unsecured Revolving Credit Facility | SOFR Benchmark Rate | Maximum
Debt Instrument [Line Items]
Margin interest rate									1.625%

Debt and Credit Facilities - _2

Debt and Credit Facilities - Schedule of Aggregate Amount of Debt (Details) - Private Placement $ in Thousands	Jul. 01, 2014 USD ($)
Debt Instrument [Line Items]
Debt Amount	$ 250,000
Senior Note, Series A
Debt Instrument [Line Items]
Debt Amount	$ 50,000
Maturity Date	Jul. 15, 2021
Interest Rates	4.44%
Senior Note, Series B
Debt Instrument [Line Items]
Debt Amount	$ 100,000
Maturity Date	Jul. 15, 2024
Interest Rates	4.98%
Senior Note, Series C
Debt Instrument [Line Items]
Debt Amount	$ 60,000
Maturity Date	Jul. 15, 2026
Interest Rates	5.13%
Senior Note, Series D
Debt Instrument [Line Items]
Debt Amount	$ 40,000
Maturity Date	Jul. 15, 2029
Interest Rates	5.38%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Effective income tax rate	24%	25.50%	23.50%	25.80%
U.S. corporate tax rate	21%		21%
Deferred tax assets, valuation allowance	$ 28.5		$ 28.5
Liability for income taxes associated with unrecognized tax benefits	22.7		22.7		$ 21.2
Decrease in unrecognized tax benefits during the next twelve months	$ 4		$ 4

Contingencies - Additional Info

Contingencies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2022 Claim
Commitments And Contingencies Disclosure [Abstract]
Number of claims outstanding	0

Retirement Benefit Plan - Addit

Retirement Benefit Plan - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares fully vested, Description			Shares allocated to a participant’s account are fully vested after three years of credited service, or in the event(s) of reaching age 65, death or disability while an active employee of the Company.
Shares fully vested after credited service			3 years
Common stock shares outstanding including ESOP	103,470,622		103,470,622		103,659,731
Company's stock held by ESOP	64,144,230		64,144,230		70,328,237
Direct Costs of Contracts and Selling, General and Administrative Expense
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
ESOP contribution expense	$ 15.4	$ 14.8	$ 42	$ 41.3

Investments in and Advances t_3

Investments in and Advances to Joint Ventures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Letters of credit outstanding amount	$ 239.8		$ 239.8		$ 223
Write-down on unconsolidated joint venture	6.4	$ 5.5	9.4	$ 10.6
Decrease in operating income	6.4	5.5	9.4	10.6
Decrease in net income net of tax	$ 4.8	$ 4.1	$ 7	$ 7.9
Decrease in earnings per share diluted	$ 0.04	$ 0.04	$ 0.06	$ 0.07
Unconsolidated Joint Ventures
Schedule Of Equity Method Investments [Line Items]
Net distributions from (contributions to) unconsolidated joint ventures	$ 13.2	$ 7.3	$ 21.4	$ 0.5
Consolidated Joint Ventures
Schedule Of Equity Method Investments [Line Items]
Letters of credit outstanding amount	$ 99.2		$ 99.2		$ 73.2

Investments in and Advances t_4

Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 1,610,798		$ 1,610,798		$ 1,632,351
Total assets	4,094,990		4,094,990		3,830,940
Current liabilities	1,149,479		1,149,479		1,030,784
Total liabilities	2,089,898		2,089,898		1,893,828
Total joint venture equity	1,953,066		1,953,066		1,900,768
Revenue	1,134,370	$ 956,050	3,092,160	$ 2,710,103
Costs	872,423	734,652	2,388,095	2,084,062
Net income attributable to Parsons Corporation	29,571	19,358	68,533	35,099
Net income attributable to noncontrolling interests	14,024	7,411	21,685	17,711
Consolidated Joint Ventures
Schedule Of Equity Method Investments [Line Items]
Current assets	268,561		268,561		246,342
Noncurrent assets	7,885		7,885		2,180
Total assets	276,446		276,446		248,522
Current liabilities	169,233		169,233		175,637
Total liabilities	169,233		169,233		175,637
Total joint venture equity	107,213		107,213		$ 72,885
Revenue	130,344	101,816	333,967	296,685
Costs	101,882	86,726	289,485	260,129
Net income attributable to Parsons Corporation	28,462	15,090	44,482	36,556
Net income attributable to noncontrolling interests	$ 14,024	$ 7,411	$ 21,685	$ 17,711

Investments in and Advances t_5

Investments in and Advances to Joint Ventures - Summary of Financial Information for Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 1,610,798		$ 1,610,798		$ 1,632,351
Total assets	4,094,990		4,094,990		3,830,940
Current liabilities	1,149,479		1,149,479		1,030,784
Total liabilities	2,089,898		2,089,898		1,893,828
Total joint venture equity	1,953,066		1,953,066		1,900,768
Investments in and advances to unconsolidated joint ventures	99,424		99,424		110,688
Revenue	1,134,370	$ 956,050	3,092,160	$ 2,710,103
Costs	872,423	734,652	2,388,095	2,084,062
Net income attributable to Parsons Corporation	29,571	19,358	68,533	35,099
Equity in earnings of unconsolidated joint ventures	(974)	9,570	10,237	26,528
Unconsolidated Joint Ventures
Schedule Of Equity Method Investments [Line Items]
Current assets	1,770,762		1,770,762		1,620,735
Noncurrent assets	487,823		487,823		531,261
Total assets	2,258,585		2,258,585		2,151,996
Current liabilities	1,357,131		1,357,131		1,088,985
Noncurrent liabilities	467,030		467,030		669,911
Total liabilities	1,824,161		1,824,161		1,758,896
Total joint venture equity	434,424		434,424		393,100
Investments in and advances to unconsolidated joint ventures	99,424		99,424		$ 110,688
Revenue	782,880	728,461	1,762,420	1,701,262
Costs	774,030	697,493	1,711,555	1,604,538
Net income attributable to Parsons Corporation	$ 8,850	$ 30,968	$ 50,865	$ 96,724

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - Unconsolidated joint ventures - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Related Party Transaction [Line Items]
Revenues	$ 59.9	$ 48.3	$ 159	$ 152.9
Reimbursable cost incurred	$ 41.7	$ 37.3	$ 112.7	$ 116.9

Related Party Transactions - Sc

Related Party Transactions - Schedule of Consolidated Balance Sheet Related to Services Provided to Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Contract assets	$ 642,264	$ 579,216
Contract liabilities	197,749	171,671
Unconsolidated Joint Ventures
Related Party Transaction [Line Items]
Accounts receivable	37,657	30,246
Contract assets	27,037	16,069
Contract liabilities	$ 12,642	$ 10,605

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares of common stock repurchased					100,000,000
Stock repurchase program commencement date			Aug. 12, 2021
Stock repurchase program, remaining authorized repurchase amount	$ 58,800,000		$ 58,800,000
Stock-based Awards
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	2,449	4,656	11,564	6,838

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Weighted Average Number of Shares Used To Compute Basic and Diluted EPS (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Basic weighted average number of shares outstanding	103,608,135	102,478,095	103,684,048	102,463,511
Stock-based awards	918,090	751,807	746,702	637,686
Convertible senior notes	8,916,530	8,916,530	8,916,530	8,916,530
Diluted weighted average number of shares outstanding	113,442,755	112,146,432	113,347,280	112,017,727

Earnings Per Share - Net Income

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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to Parsons Corporation	$ 29,571	$ 19,358	$ 68,533	$ 35,099
Convertible senior notes if-converted method interest adjustment	545	534	1,627	1,593
Diluted net income attributable to Parsons Corporation	$ 30,116	$ 19,892	$ 70,160	$ 36,692

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule of Repurchase Program (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Total shares repurchased	95,413	245,000	522,501	245,000
Total shares retired	95,413	245,000	522,501	245,000
Average price paid per share	$ 41.42	$ 35.51	$ 37.32	$ 35.51

Segment Information - Additiona

Segment Information - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Revenues	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Property and equipment, net	94,518		94,518		$ 104,196
United States
Segment Reporting Information [Line Items]
Revenues	851,500	$ 730,700	2,300,000	$ 2,000,000
Property and equipment, net	$ 84,000		$ 84,000		$ 95,000

Segment Information - Summary o

Segment Information - Summary of Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Federal Solution Segment
Segment Reporting Information [Line Items]
Total revenue	620,416	499,291	1,649,601	1,394,035
Critical Infrastructure
Segment Reporting Information [Line Items]
Total revenue	$ 513,954	$ 456,759	$ 1,442,559	$ 1,316,068

Segment Information - Summary_2

Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Adjusted EBITDA attributable to Parsons Corporation
Adjusted EBITDA attributable to Parsons Corporation	$ 88,549	$ 76,852	$ 232,307	$ 200,808
Adjusted EBITDA attributable to noncontrolling interests	14,138	7,540	22,042	18,010
Depreciation and amortization	(29,578)	(37,232)	(90,668)	(106,540)
Interest expense, net	(5,941)	(3,987)	(14,168)	(13,188)
Income tax expense	(13,792)	(9,165)	(27,643)	(18,378)
Equity-based compensation expense	(7,125)	(3,224)	(15,814)	(15,125)
Transaction-related costs	(2,563)	(2,537)	(14,486)	(9,269)
Restructuring expense		(357)	(213)	(507)
Other	(93)	(1,121)	(1,139)	(3,001)
Net income including noncontrolling interests	43,595	26,769	90,218	52,810
Net income attributable to noncontrolling interests	14,024	7,411	21,685	17,711
Net income attributable to Parsons Corporation	29,571	19,358	68,533	35,099
Federal Solution Segment
Adjusted EBITDA attributable to Parsons Corporation
Adjusted EBITDA attributable to Parsons Corporation	61,004	46,481	151,287	110,963
Critical Infrastructure
Adjusted EBITDA attributable to Parsons Corporation
Adjusted EBITDA attributable to Parsons Corporation	$ 27,545	$ 30,371	$ 81,020	$ 89,845

Segment Information - Summary_3

Segment Information - Summary of Revenues and Property and Equipment, Net by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Property and Equipment, Net	94,518		94,518		$ 104,196
North America
Segment Reporting Information [Line Items]
Revenues	944,942	804,122	2,571,741	2,245,515
Property and Equipment, Net	90,820		90,820		100,674
Middle East
Segment Reporting Information [Line Items]
Revenues	184,680	147,207	504,078	448,525
Property and Equipment, Net	3,698		3,698		$ 3,522
Rest of World
Segment Reporting Information [Line Items]
Revenues	$ 4,748	$ 4,721	$ 16,341	$ 16,063

Segment Information - Summary_4

Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,134,370	$ 956,050	$ 3,092,160	$ 2,710,103
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	620,416	499,291	1,649,601	1,394,035
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	351,419	332,080	1,037,244	929,044
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	268,997	167,211	612,357	464,991
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	513,954	456,759	1,442,559	1,316,068
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	184,288	162,960	517,725	444,848
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	$ 329,666	$ 293,799	$ 924,834	$ 871,220

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 28, 2022	Oct. 26, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Unsecured Revolving Credit Facility
Subsequent Event [Line Items]
Interest expense			$ 2.5	$ 0.1	$ 3.4	$ 0.6
Subsequent Event | Unsecured Revolving Credit Facility
Subsequent Event [Line Items]
Interest expense		$ 2.1
Subsequent Event | 2022 Delayed Draw Term Loan
Subsequent Event [Line Items]
Borrowings under term loan	$ 350
Private Placement | Subsequent Event | Unsecured Revolving Credit Facility
Subsequent Event [Line Items]
Repayments of debt		$ 200