Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregated Revenues

Disaggregated revenues by customer type were as follows (in thousands):

	Year Ended December 31, 2020
	GMS		NSS		Total
DoD	$	807,722	$	277,134	$	1,084,856
Other U.S. government agencies	1,079,345		264,185		1,343,530
Commercial and non-U.S. customers	193,407		92,835		286,242
Total	$	2,080,474	$	634,154	$	2,714,628

	Year Ended December 31, 2019
	GMS		NSS		Total
DoD	$	858,623	$	222,978	$	1,081,601
Other U.S. government agencies	1,123,459		359,681		1,483,140
Commercial and non-U.S. customers	117,655		81,497		199,152
Total	$	2,099,737	$	664,156	$	2,763,893

	Year Ended December 31, 2018
	GMS		NSS		Total
DoD	$	784,532	$	205,404	$	989,936
Other U.S. government agencies	1,096,193		359,977		1,456,170
Commercial and non-U.S. customers	88,118		74,338		162,456
Total	$	1,968,843	$	639,719	$	2,608,562

Revenues by contract type were as follows (in thousands):

	Year Ended December 31, 2020
	GMS		NSS		Total
Cost-reimbursable	$	1,182,865	$	166,026	$	1,348,891
Fixed-price	676,714		269,530		946,244
Time and materials	220,895		198,598		419,493
Total	$	2,080,474	$	634,154	$	2,714,628

	Year Ended December 31, 2019
	GMS		NSS		Total
Cost-reimbursable	$	1,206,710	$	105,360	$	1,312,070
Fixed-price	717,595		286,366		1,003,961
Time and materials	175,432		272,430		447,862
Total	$	2,099,737	$	664,156	$	2,763,893

	Year Ended December 31, 2018
	GMS		NSS		Total
Cost-reimbursable	$	1,229,707	$	90,061	$	1,319,768
Fixed-price	595,127		281,859		876,986
Time and materials	144,009		267,799		411,808
Total	$	1,968,843	$	639,719	$	2,608,562

Disaggregated revenues by geographic location were as follows (in thousands):

	Year Ended December 31, 2020
	GMS		NSS		Total
United States	$	1,104,536	$	626,961	$	1,731,497
International	975,938		7,193		983,131
Total	$	2,080,474	$	634,154	$	2,714,628

	Year Ended December 31, 2019
	GMS		NSS		Total
United States	$	1,090,765	$	657,706	$	1,748,471
International	1,008,972		6,450		1,015,422
Total	$	2,099,737	$	664,156	$	2,763,893

	Year Ended December 31, 2018
	GMS		NSS		Total
United States	$	1,013,830	$	635,158	$	1,648,988
International	955,013		4,561		959,574
Total	$	1,968,843	$	639,719	$	2,608,562