Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

Disaggregation Of Revenue [Abstract]

Disaggregation of Revenue

Disaggregation of Revenue

	Three Months Ended
	March 31, 2018
Client Markets:
Energy, environment, and infrastructure	$	124,352
Health, education, and social programs		123,204
Safety and security		25,322
Consumer and financial		29,902
Total	$	302,780

	Three Months Ended
	March 31, 2018
Client Type:
U.S. federal government	$	133,544
U.S. state and local government		31,986
International government		28,804
Total Government		194,334
Commercial		108,446
Total	$	302,780

	Three Months Ended
	March 31, 2018
Contract Mix:
Fixed-price	$	121,042
Time-and-materials		125,630
Cost-based		56,108
Total	$	302,780

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	March 31, 2018			At date of adoption			Change
Contract asset	$	128,522		$	123,197		$	5,325
Contract liabilities		(32,281	)		(38,571	)		6,290
Net contract assets (liabilities)	$	96,241		$	84,626		$	11,615