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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2021

Revenue From Contract With Customer [Abstract]

Disaggregation of Revenue

Disaggregation of Revenue

	Year ended December 31,
	2021				2020				2019
Client Markets:
Energy, environment, and infrastructure	$	654,488			$	609,358			$	663,799
Health, education, and social programs		678,047				677,454				567,351
Safety and security		115,266				120,599				118,279
Consumer and financial		105,247				99,464				129,096
Total	$	1,553,048			$	1,506,875			$	1,478,525

	Year ended December 31,
	2021				2020				2019
Client Type:
U.S. federal government	$	735,031			$	666,968			$	560,953
U.S. state and local government		233,757				219,507				279,833
International government		136,245				93,581				122,125
Total Government		1,105,033				980,056				962,911
Commercial		448,015				526,819				515,614
Total	$	1,553,048			$	1,506,875			$	1,478,525

	Year ended December 31,
	2021				2020				2019
Contract Mix:
Time-and-materials	$	633,574			$	732,365			$	700,980
Fixed-price		645,351				536,903				566,299
Cost-based		274,123				237,607				211,246
Total	$	1,553,048			$	1,506,875			$	1,478,525

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	December 31, 2021				December 31, 2020				Change
Contract assets	$	137,867			$	143,369			$	(5,502	)
Contract liabilities		(39,665	)			(42,050	)			2,385
Net contract assets	$	98,202			$	101,319			$	(3,117	)

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045

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X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

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- References

No definition available.

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